Codex App right-sidebar Outputs panel duplicates and reindexes images when toggling Show/Collapse

What version of the Codex App are you using (From “About Codex” dialog)?

26.527.31326 (3390)

What subscription do you have?

Unknown

What platform is your computer?

macOS 26.1, Darwin 25.1.0 arm64 arm

What issue are you seeing?

In Codex App, the right-side information panel's Outputs image list appears to mutate when toggling the expanded/collapsed state.

When a thread has multiple image outputs and the right sidebar shows the Outputs section with a Show X / expand control:

• Clicking Outputs, then clicking Show X, causes the original first image to change to the image at approximately 1 + the number of images that were visible before expanding.
• After collapsing the list and repeating expand/collapse, the output image list keeps accumulating duplicate entries.
• Repeating the same toggle can grow the visible output list to hundreds of duplicated images without generating any new images.

This looks like a UI state/rendering bug in the Outputs panel: expanding/collapsing appears to append or reindex the existing image collection instead of only changing which existing images are visible.

What steps can reproduce the bug?

1. Open Codex App on macOS.
2. Use or open a thread that has multiple generated image outputs, enough for the right-side Outputs panel to show a collapsed image list with a Show X / expand control.
3. Click the right-side information panel's Outputs entry.
4. Note the initially visible images and the first visible image.
5. Click Show X to expand the output images.
6. Observe that the original first image changes to a later image, roughly the image at index 1 + the number of images that were visible before expanding.
7. Click collapse / hide.
8. Repeat the expand/collapse toggle several times.
9. Observe that duplicate image entries accumulate and the list can grow to hundreds of images, even though no new image generation has occurred.

What is the expected behavior?

Expanding and collapsing the right-sidebar Outputs image list should only change visibility. It should not:

• duplicate image entries;
• mutate the underlying output image array;
• change the identity/order of the first image;
• grow the number of outputs when no new images were generated.

The image order and count should remain stable across repeated expand/collapse toggles.

Additional information

I searched existing open issues before filing. Related but distinct issues include:

• #24446 / #25286: stale cached local images when paths are reused;
• #21232 / #22603 / #22991: image-heavy threads or large rollout files causing performance/freezing problems.

This report appears different: the reproduction only requires toggling the right-sidebar Outputs expand/collapse UI, and the visible list duplicates/reindexes without any underlying file regeneration or new image generation.