[BUG] WIth the "Save output as CSV file" and "Expand Table" features for Polars output

[ThomasGenetRepo]

Mage version

0.9.70

Describe the bug

When returning a (non-empty) Polars dataframe from a transform block and clicking the "Save output as CSV file" it downloads an empty CSV file (doesn't even have the column headers) and clicking the "Expand Table" button at the bottom right of the block output shows an empty table in the "Table" pane.

When converting to Pandas before returning the data, both the save as csv & expand table functions work just as expected, the issue only arises when returning Polars.

To reproduce

Have a transform block return a Polars dataframe, run the block, then click the "Expand Table" button then click the "Save output as CSV file" button at the bottom right of the block output.

Expected behavior

A table should show up in the table pane when clicking the "Expand Table" button. A non-empty CSV file should be downloaded when clicking the "Save output as CSV file" button.

Screenshots

No response

Operating system

No response

Additional context

No response