Hightlight stop working when perform infix search with fallback operation

[SanthoshVeerabathiran]

Description

Highlights are stop working, when i perform infix search with fallback operation in the search parameters

Steps to reproduce

1. My collection schema with infix enable for id_2 field:

{
    created_at: 1715666438,
    default_sorting_field: '',
    enable_nested_fields: true,
    fields: [
      {
        facet: false,
        index: true,
        infix: false,
        locale: '',
        name: 'id_7',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      },
      {
        facet: false,
        index: true,
        infix: false,
        locale: '',
        name: 'id_6',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      },
      {
        facet: false,
        index: true,
        infix: false,
        locale: '',
        name: 'id_8',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      },
      {
        facet: false,
        index: true,
        infix: false,
        locale: '',
        name: 'id_5',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      },
      {
        facet: false,
        index: true,
        infix: true,
        locale: '',
        name: 'id_2',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      },
      {
        facet: false,
        index: true,
        infix: false,
        locale: '',
        name: 'id_4',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      },
      {
        facet: false,
        index: true,
        infix: false,
        locale: '',
        name: 'id_3',
        optional: true,
        sort: false,
        stem: false,
        type: 'string'
      }
    ],
    name: 'sample',
    num_documents: 5,
    symbols_to_index: [],
    token_separators: []
} 

2. Sample Documents:

[
        {
            id_5: '82237e7b23c8d00c10',
            id_2: '822352dd4972780d06',
            id_3: '82237e7b98c8d01919',
            id_4: '23456',
            id_6: '947693749840',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        {
            id_5: '82237e7b23c8d00c18',
            id_2: '822352dd49727890b8',
            id_3: '82237e7b98c8d01919',
            id_4: '23457',
            id_6: '947693749840',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        {
            id_5: '82237e7b23c8d00c10',
            id_2: '822352dd4972785439',
            id_3: '82237e7b98c8d01919',
            id_4: '23765',
            id_6: '947693749840',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        {
            id_5: '82237e7b23c8d00c11',
            id_2: '822352dd497278v654',
            id_3: '82237e7b98c8d01919',
            id_4: '23987',
            id_6: '947693749840',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        {
            id_5: '82237e7b23c8d00c12',
            id_2: '822352dd497278b0b1',
            id_3: '82237e7b98c8d01919',
            id_4: '239432',
            id_6: '947693749842',
            id_7: '9834758374587',
            id_8: '822399482342'
        }
]

3. Search Parameters:

{ 
        q: '822352d5', 
        query_by: 'id_2', 
        infix: 'fallback', 
        per_page: 3 
}

Expected Behavior

When i search q = 822352d5 with infix = fallback , I expect highlights are working like below:

{
    facet_counts: [],
    found: 5,
    hits: [
        {
        document: {
            id: '4',
            id_1: '82237e7b23c8d00c12',
            id_2: '822352dd497278b0b1',
            id_3: '82237e7b98c8d01919',
            id_4: '239432',
            id_6: '947693749842',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        highlight: {
            id_2: {
            matched_tokens: [ '822352dd' ],
            snippet: '<mark>822352dd</mark>497278b0b1'
            }
        },
        highlights: [
            {
            field: 'id_2',
            matched_tokens: [ '822352dd' ],
            snippet: '<mark>822352dd</mark>497278b0b1'
            }
        ],
        text_match: 578730020285972600,
        text_match_info: {
            best_field_score: '1108041007104',
            best_field_weight: 15,
            fields_matched: 1,
            num_tokens_dropped: 0,
            score: '578730020285972601',
            tokens_matched: 1,
            typo_prefix_score: 3
        }
        },
        {
        document: {
            id: '3',
            id_1: '82237e7b23c8d00c11',
            id_2: '822352dd497278v654',
            id_3: '82237e7b98c8d01919',
            id_4: '23987',
            id_6: '947693749840',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        highlight: {
            id_2: {
            matched_tokens: [ '822352dd' ],
            snippet: '<mark>822352dd</mark>497278v654'
            }
        },
        highlights: [
            {
            field: 'id_2',
            matched_tokens: [ '822352dd' ],
            snippet: '<mark>822352dd</mark>497278v654'
            }
        ],
        text_match: 578730020285972600,
        text_match_info: {
            best_field_score: '1108041007104',
            best_field_weight: 15,
            fields_matched: 1,
            num_tokens_dropped: 0,
            score: '578730020285972601',
            tokens_matched: 1,
            typo_prefix_score: 3
        }
        },
        {
        document: {
            id: '2',
            id_2: '822352dd4972785439',
            id_3: '82237e7b98c8d01919',
            id_4: '23765',
            id_5: '82237e7b23c8d00c10',
            id_6: '947693749840',
            id_7: '9834758374587',
            id_8: '822399482342'
        },
        highlight: {
            id_2: {
            matched_tokens: [ '822352dd' ],
            snippet: '<mark>822352dd</mark>4972785439'
            }
        },
        highlights: [
            {
            field: 'id_2',
            matched_tokens: [ '822352dd' ],
            snippet: '<mark>822352dd</mark>4972785439'
            }
        ],
        text_match: 578730020285972600,
        text_match_info: {
            best_field_score: '1108041007104',
            best_field_weight: 15,
            fields_matched: 1,
            num_tokens_dropped: 0,
            score: '578730020285972601',
            tokens_matched: 1,
            typo_prefix_score: 3
        }
        }
    ],
    out_of: 5,
    page: 1,
    request_params: {
        collection_name: 'sample',
        first_q: '822352d5',
        per_page: 3,
        q: '822352d5'
    },
    search_cutoff: false,
    search_time_ms: 0
}

Actual Behavior

But, highlights are empty

{
        facet_counts: [],
        found: 5,
        hits: [
            {
            document: {
                id: '4',
                id_1: '82237e7b23c8d00c12',
                id_2: '822352dd497278b0b1',
                id_3: '82237e7b98c8d01919',
                id_4: '239432',
                id_6: '947693749842',
                id_7: '9834758374587',
                id_8: '822399482342'
            },
            highlight: {},
            highlights: [],
            text_match: 578730020285972600,
            text_match_info: {
                best_field_score: '1108041007104',
                best_field_weight: 15,
                fields_matched: 1,
                num_tokens_dropped: 0,
                score: '578730020285972601',
                tokens_matched: 1,
                typo_prefix_score: 3
            }
            },
            {
            document: {
                id: '3',
                id_1: '82237e7b23c8d00c11',
                id_2: '822352dd497278v654',
                id_3: '82237e7b98c8d01919',
                id_4: '23987',
                id_6: '947693749840',
                id_7: '9834758374587',
                id_8: '822399482342'
            },
            highlight: {},
            highlights: [],
            text_match: 578730020285972600,
            text_match_info: {
                best_field_score: '1108041007104',
                best_field_weight: 15,
                fields_matched: 1,
                num_tokens_dropped: 0,
                score: '578730020285972601',
                tokens_matched: 1,
                typo_prefix_score: 3
            }
            },
            {
            document: {
                id: '2',
                id_2: '822352dd4972785439',
                id_3: '82237e7b98c8d01919',
                id_4: '23765',
                id_5: '82237e7b23c8d00c10',
                id_6: '947693749840',
                id_7: '9834758374587',
                id_8: '822399482342'
            },
            highlight: {},
            highlights: [],
            text_match: 578730020285972600,
            text_match_info: {
                best_field_score: '1108041007104',
                best_field_weight: 15,
                fields_matched: 1,
                num_tokens_dropped: 0,
                score: '578730020285972601',
                tokens_matched: 1,
                typo_prefix_score: 3
            }
            }
        ],
        out_of: 5,
        page: 1,
        request_params: {
            collection_name: 'sample',
            first_q: '822352d5',
            per_page: 3,
            q: '822352d5'
        },
        search_cutoff: false,
        search_time_ms: 0
}

Metadata

Typesense Version: 26.0

OS: Mac OS