This looks like one of the color blindness filters got activated. Here on Plasma 6, it's a Desktop Effect in the System Settings. Not quite sure, if that was also already the case in Plasma 5, but if you just type "blind" into the search bar of the System Settings, then it should show up and you can disable it.
Your colors are inverted.
The accessibility icon never follows accent color, and firewall is always red not blue.
Something is swapping your colors around.
Maybe color correction for the color blind?
New plasma update sets the accent colour from your background. To change it go to System Settings > Colours and Themes > Colours (not sure if Mint has it in the same place) then set the accent colour you like from the top.
Oh I see, that is odd. I thought your background was yellow beforehand. Is it perhaps plasma's Night Light? That will tint everything yellow when it's enabled.
My background isn't yellow, it's mountains with a blue sky.
I believe this might be an issue with an app called redshift that automatically comes with mint, it uses geoclue2 which relies on Mozilla Location Service which got shut down like 2 weeks ago. Maybe it malfunctioned that even uninstalling it doesn't help
That can happen if you make a major change such as major update to the binaries (ie a software update) while the screen is locked. Or because the screen "saver" / "locker" crashed.
I'm also experiencing this bug, regardless on which theme I set (Breeze, Breeze Dark, Breeze Dark EndeavourOS, Breeze Twilight). The folder icon is the only one with this problem, and only when the window has focus
KDE
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