Change of time signature deletes existing start repeat, or End-start repeat, barline

OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.4.2.9788, revision: 148e43f

1. Start with a simple blank 4/4 score.
2. Create a start repeat barline anywhere
3. Select the measure rest after the repeat barline and add a 3/4 time sig., say.

Expected result: Time signature is inserted before the start repeat barline.
Actual result: The start repeat barline reverts to a single barline and the time sig. is placed after it.

The workaround is to add the time sig. before a single barline, then change it to a start repeat barline. A similar problem with End-start repeat barlines. End repeat barlines are unaffected.