There was a period when KDE 6 was new and the Wayland stuff on top of it, where Kröhnkite didn't work well. I use it since then as my daily driver and don't have issues. Off course there might be edge cases and I do not resize windows manually much, in tiling mode. But I use floating mode too and resize windows to my liking and don't have an issue like that.

BTW there is an fantastic "Dock" mode in Kröhkite, where you can define a window to be a dock that is always visible on the left/right or up/bottom area of all desktops; behaves similar to a normal dock from KDE Plasma. It's a function I never saw in any other desktop environments or tilers.