Opening and closing Instruments dialog causes tablature to change to treble staff
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 220.127.116.1103, revision: d7350e5
Open attached file. Open and close the Instruments dialogue. Result: The tablature staff changes to an 8vb treble staff. Vertical lines have also appeared in the same staff.