I wouldn’t say 0 issues as I have occasional clipboard issues with XWayland apps or KWin crashing results in loss of work. I also find my HP Anyware PCoIP performance to be slightly downgraded compared to X11.
However, the upsides, such as multi-refresh rate and what feels like smoother performance on my RX 6900 XT (home, Tuxedo OS) and Vega 56 (office, KDE Neon) far outweigh it.
I think its fixed now with 6.1.5
Strangely, I had issues with most of my smb shares not recognizing the Kerberos credentials I had, which was coincidentally fixed around 6.1.5