Key signature change suddenly moves to another bar while inserting ala breve mark

Steps to reproduce: (Using version 3.4.2.9788 148e43f on Windows 10)

1) Create a new score and add Bb trumpet. Make sure the key signature is concert Bb major and the time signature is 4/4
2) Add a key signature change to concert G major in bar 2
3) Add a key signature change to concert C major in bar 4
4) You will now have something like the attached file "BeforeAlaBreve"

5) Add an ala breve sign to bar 2.
6) Notice that the key signature change in bar 4 moves to bar 3
7) I have saved this state in the file "AfterAlaBreve"

Expected result:
*) The key signature change to concert C major should stay in bar 4