In the attached test case, the y position of the lower green box is not recomputed when the height of the upper green box changes.
Created attachment 20934 [details] Test case
Because the positioned object is in the skipped white space before the beginning of a line, it doesn't get a line box, so it doesn't move with the line.
All browsers (STP160, Safari 16.2, Chrome Canary 111 and Firefox Nightly 110) are matching in the above testcase, I think over the time, we might have fixed it. Can we mark this as "RESOLVED CONFIGURATION CHANGED"?
Yes, thanks for testing.