It's not uncommon. I feel it takes away from the impact of the TF and teases you, but it's a bit more forgiving to the characters. Off the top of my head, I know
Silverwolf had a couple of commissions that did just that, as well as
Zekey, although this is more of a backwards TF. Just about every mainstream transformation like werewolves or single episode transformations revert as well to avoid carrying it over to other episodes.