Defenses not targeting giants

Just now really started noticing this since the last update, but it seems when I'm raiding that some defenses will just stop attacking my giants and start attacking my other troops randomly or target my other troops before targeting giants. An example:
Using giant/healer, I'll send in my giants to start and once it's open to the center I drop my goblins. They all run to the center to smack on the storages, and the mortars that are shooting my giants will start shooting the gobs. Or the archer towers stop shooting the giants to pick off the gobs. Giants are still within range, haven't moved.
I even had one instance where my lone giant that broke off from the pack started attacking a wall to get at a tesla (which was right behind the wall being attacked). My healer goes over to heal the said giant and the tesla stops attacking the giant to attack the healer.
I thought giants were supposed to be the focus of the defensive buildings. Or at least figured a defensive building had to kill its target (or if target moves out of range) before selecting a new target.
Does anyone else notice this happening?