For "some" time (for sure since KDE >= 6.0, but maybe even with KDE 5.X - I forgot) I have been running the following script to enable copy-paste (CTRL+C / CTRL+V) to Windows applications running with Wine:
#!/bin/bash
wl-paste -t text -w xclip -selection clipboard &

I am automatically running the above script at login and it works for the whole session duration.

If I attempt to upgrade to KDE 6.5 (and now 6.5.1), I cannot longer run it as it give the following error: "Watch mode requires a compositor that supports the wlroots data-control protocol". As side effect of this, I cannot longer paste any text  to any Windows applications running with Wine.

SUMMARY

STEPS TO REPRODUCE
1. Copy some text from a Linux application
2. Switch to a program running with Wine
3. Try to past the text

OBSERVED RESULT
Nothing get pasted.

EXPECTED RESULT
Text getting pasted as usual.