Do you mean that you found a bug report but lost track of it?
KWin has never been so crash-prone for me as it has for you. Here: latest packages, FreeBSD 14.0-CURRENT.
Actually, I mean KWin has never been as stable for me as it apparently has been for you. I have had occasional crashing of KWin from FreeBSD 9 through 12 over two different machines and many ports revisions. When it started crashing more frequently, I abandoned it.
I am not able to move to CURRENT at this time.