You can report it to developers of an app which prints these warnings. It could be a bug where some functionality doesn't work as expected on Wayland.
KDE
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Haha its mostly Qt stuff and I literally just get these errors, no idea why. Gave up on reporting Qt bugs tbh, last one was closed afaik even though I knew the app
Well it could be that the application uses some Qt functionality that does nothing on Wayland, and the developer may not be aware of that. Though it could be challenging to fix this in a cross-platform way.
BTW those warnings about requestActivate should go away when those apps migrate to Qt 6.