Making Plasma 6.3.4 more notable than the other routine point releases is that this version brings fixes to some of the most prominent Plasma / KWin crashes . There are also some other subtle refinements like better visual quality when Spectacle screen recording and using fractional scaling or pixel perfection for KWin effects like wobbly windows , but most significant could be argued as the prominent crash fixes.
There are also a few Wayland fixes for KWin, addressing some different glitches, and several Plasma Workspace fixes. More details on the Plasma 6.3.4 release via KDE.org .