When duplicating a part in a specific song, VST Live unexpectedly jumps to the first song, moves its first part to the end, and renames it. This issue only occurs if the duplicated part also exists in the first song.
By moving another song that doesn’t contain this part to position 1, the part can be duplicated as intended. However, if the duplicated part is then moved to the new first song, the initial behavior reoccurs.
Before I identified this strange behavior, it caused several instances of my first song being messed up.