Testing Pop OS 24.04 LTS.
When Switching to light theme, I used the camera app by gnome, some of the symbol colors can't be seen and it's on dark color. When I switched to Dark theme it's just on light theme now after relaunching the gnome camera app.
Light Theme:

Icons are black.
Dark Theme:

Icons now in white.
It might happen on some GUI parts of browser or other applications too. I'm glad I had to report this bug and help a bit.