Huh, another update. 
Finally masks and layers with clipping enabled is fixed ( i guess ). Should work now with clipped layers too…
Please try to test different cases for transparency masks, filter masks and other masks, and styles (FX) effects (this maybe slow, but i found that vanila Krita is ~ same slow with styles for inherint alpha layers too) and their combo with and without combo of usual clipped layers. Earlier masks and FX was completely disabled because they caused a heavy dirty rectangles and artifacts during stroke or any update actions.
Maybe if clippijng finally works fine enough now for most cases i will try to cleanup everything and make a merge request to master.
Current diff (windows) (still to 9d4fcc7 commit, make checkout to this state for apply) https://www.dropbox.com/scl/fi/o2xaoxhk43tx62wbn9u8y/clipping_kirta_win_diff_5-3_0_9d4fcc7_04_14_2026_31_init.diff?rlkey=50107voftqec4asqg2hshrdml&st=d9t153x6&dl=1