There is a bug when toggle loop playback in MuseScore 4.0.2.

When toggle loop playback it doesn't play all the way to the end of the song. It plays halfway of the song then it jumps to the beginning of the song in MuseScore 4.0.2. It happens when I open a song from MuseScore 3.2 to Musescore 4.0.2. and save as.