Fl4k pet suddenly dying to friendly explosions

So been running Fl4k for a bit and have used explosive weapons in the past with no problem. Currently using a shotgun that fires grenades and have been doing well with it. No problems with it killing my pet. I exit the game and later come back, suddenly my pet is dying to all explosions caused by my weapons. If I kill an enemy and the pet is close to it, the pet dies. Out of combat I can hit him with the explosives and he is fine. It is only when he is near an enemy I kill with explosive weapons.

Why all of a sudden is it dying?