Entering begin/continue/end text for a line only works on second attempt

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

1. Add a line to a score.
2. In the inspector tick the "Begin text" box to open the text entry dialogue
3. Click in the text entry box.

Result - text entry dialogue collapses and "Begin text" box is unticked

4. tick the "Begin text" box again to open the text entry dialogue
5. Click in the text entry box

Result - text entry box stays open and text can be entered.

This seems to happen with all newly added lines and with begin, continue and end texts. After the initial collapse, on any subsequent opening of a text entry dialogue for that line there is no problem.