ACR multi-masks misaligned [bug]

ACR masks become misaligned after copying and inverting, or after AI Denoise

Steps to reproduce:

1. Open several photos (I usually work with 30–50).

2. Select all photos (Ctrl+A).

3. Open Masking and select Subject.

4. Without deselecting the photos, rename the mask to “Subject” for all of them.

5. Deselect all photos.

6. Manually edit each mask on each photo using brushes, adding/removing areas, etc.

7. Select all photos again.

8. Select the previously created “Subject” mask and copy it with Invert enabled.

9. Observe that the manual edits to both the original and inverted masks are now misaligned or applied to the wrong areas. Both masks must be manually corrected across all photos.

Related issues:

• Masks sometimes become misaligned if created or edited before running AI Denoise.

• The same problem occurs with the Remove tool: if objects are removed before running AI Denoise, the removal edits shift by a few percent afterward.

These issues can result in substantial rework when processing large batches of photos.

This issue has been present for a very long time, and I honestly don't know which version it first appeared in — it may have existed from the very beginning. Unfortunately, I haven't had a chance to file a bug report until now, but the issue still persists to this day.