I had a game where I had a Paladin and two Warlocks. Paladin and Warlock A casted two spells (Moonbeam, and Toxic Cloud) that both trigger when a creature enters or starts their turn in the area of effect.
The creature in question was already in the overlapping area for both, and made its saving throws. On the turn of Warlock B, he casted Banishment, which teleported the creature to a benign dimension, but immediately brought it back, hoping to trigger the reentering of the space of the two damage spells.
At the time of play, I allowed it and made the creature make new saves, which it failed, and died.
Is this the proper way to handle the banishment and return of the creature? If a creature is banished and brought back, does it count as reentering the space it was in? Or should it have been treated as already being in that area, and make the saves when the creature starts its next turn in that area?