creating part while element are selected will undesirably set the SELECTED flag for those cloned elements even though the part scores won't have a selection
Create a new score, and select some notes:
Then create parts. The resulting part will undesirably display those selected notes in blue:
They look like they're selected in the newly created part, cause they're blue, but they aren't really selected, which causes confusion. They will remain blue until selecting them and un-selecting them.
Happens in 3.0 release as well as 2.3.2