In new parts, clefs and keys are often repeated for unknown reasons.

Hi,

when making a new part of some score, then clefs and keys are repeated for unknown reasons (almost in each line of the part).

In the attached score, you may see the effect if making a new part by selecting staff line #1 (flute) and staff line #3 for example (V2).

Additionally, there are long barlines inserted (before the addional keys and clefs) connecting the 2 staff lines.

These effects disappear if saving the part and reopening it.

Remark: I opened this issue in english (https://musescore.org/en/node/114566, originally german), because nobody has answered.