Piano shows no rests in the lower staff


Here I have a problem I am not able to solve:
The piano player is changing between Cuíca and Piano (both labeled as »Pno.«). After changing from Cuíca to Piano, the lower staff doesn’t show any rests:

In galley few the piano doesn’t have rests in the lower staff right from the beginning of the flow:
Bildschirmfoto 2020-11-09 um 13.15.33.png
Hm … Whats wrong?

Put the caret on the bottom piano stave then type Shift-B rest Enter.

You’re suffering from a situation that normally only occurs when Remove Rests has been used, and sometimes in MusicXML imports.

Thanks a lot!
Its solved. It was a xml import difficulty.