Did you use 2.1.52 for long before that? The Qt 6.3.0 change in 2.1.52 seems more likely to have caused such problems than any changes made in the beta. If the crashes don’t occur in 2.1.52, can you reproduce them on latest main when running with tools/runopt? If so, would you be able to bisect the changes to figure out where the problem was introduced?
Issue’s fixed in main already.