QT Modal windows issus

My current version of Weston is 10.0, but due to stability issues, I cannot upgrade it. However, when using QT, I found that a bug from Weston 9.0 has been fixed. This bug prevented the use of modal windows, but now after commit (a8da2084), modal windows can be used again. However, after closing a modal window and clicking on the main window, Weston crashes and commit (5699dbaa) did not fix this crash bug（The Wayland connection broke. Did the Wayland compositor die?）.

May I ask if this problem can be solved? Or is it the case that this issue has already been fixed in Weston 11.0? Can you provide the corresponding commit? Looking forward to your reply.