I had it tree or four times now, at the start of a new game I make a four gem stone combo and I don’t get my extra turn but instead the enemy replies with making two gemcombos simultaniously.
I don’t know if it has anything to do with it but every time the Satyr Musician was in the other team.
This bug will apparently be fixed in the next version a few months from now. For now, wait for the enemy battle start traits to finish triggering before attempting to make any moves.