Had a crack like that… The wife said “it’s only a 5 minute job”

Sadly the (correct stuff - we rebuilt the bathroom side of the wall when we moved in) wallboard had cracked for some reason so 5 minutes to yank out a tile and stick in a new one turned into a mission - chasing the crack in the wall board, cutting the damaged bits, repairing with new pieces then replacing 4 tiles instead of one.

It hasn’t cracked again so I must have done something right (or the wall has decided to stop moving)

What’s the moral? Do not expect it to be a simple job. If it turns out to be simple, fix it, get a beer and chill. You will probably need to get a bit more involved than just replacing the tile.