Problem

sometimes editor moves whitespace to another position on after saving a segment.
Tbh. I do not know how this can be reproduced.

In the original TS-issue there is a video linked where you can see what is happening:
Aufzeichnung 2025-09-15 185155.mp4

additional problem

in some cases the content of the editor is completely lost. Sadly this also can not be reproduced by me in my test.
See second video in original issue:
Aufzeichnung 2025-09-15 185033.mp4

Solution

fix editor.