@Grum999 it looks like a regression from the multi-threaded fill layers:
3f85089fa36ad371ce1322117c0c420e806b580f is the first bad commit
commit 3f85089fa36ad371ce1322117c0c420e806b580f
Author: L. E. Segovia <amy@amyspark.me>
Date: Sun Jul 5 00:41:59 2020 +0000
Split layer into patches for multithreaded render
Next commit will move the split to the stroke strategy itself.
Will you please make a bug report on that?
There is a chance it would just need more “waitForDone()” calls or something…