While testing a PDF document with Optional Content Groups (aka "layers"), I noticed that sometimes changing the visibility of an OCG causes the colours of other items to change.

The PDF specification explicitly states "Hiding a section of optional content shall not change the colour of objects that do not belong to the same optional content group.", so I believe this is a bug in Adobe Acrobat Reader.

I am attaching the PDF file and a recording of the issue. Unfortunately the issue does not happen 100% of the time - I am not sure what triggers it, but resizing and maximising the window sometimes triggers it.

OS: Windows 11
Adobe Acrobat Reader: Continuous release 2024.001.20629