Changing clef has no effect in combination with multi measure rest
Go to part "Posaune I"
Change clef to Tenor Clef
The first line up to the key signature change will stay in Bass clef.
This happens only in the part, The score is OK.
And it happens only when there is a multi mesure rest at the beginning of the part an multi mesure rests are enabled.
I noticed this issure once before but it was fixed in the Nightly build 2019-04-16-1043. Now, in 3.1 I noticed it again.