Symmetry options have invalid positioning on a frame of an imported Sprite Sheet

[griffrawk]

LibreSprite 1.1-dev release
macOS Sonoma 14.3.1

After I imported a 8 column x 3 row spritesheet (each frame 64 x 64), I found that the symmetry options failed to have any visible effect. The guides do not appear on the frame, and there's no symmetrical effect on the tools.

However, when I zoom out, the guide appears way to the right, or below the frame, as though the overall sheet dimensions were used to calculate the centre lines.

If I open any other .png, or create a new file, then the symmetry guides and options work correctly, including after adding new frames to the animation.

[GithubOctopus]

I was able to reproduce the issue on Ubuntu 22.04.4 LTS x86_64