Crimson Township + Titanic Scarabs = Immortal Boss

Map: Crimson Township (T16), Maven witnessed
Scarabs: Titanic Scarab, Titanic Scarab of Treasures, Titanic Scarab of Legend
Video: https://youtu.be/5f39breB1MM
Bug ID: 1603029771

Issue: The boss is constantly receiving an invincibility aura from one of their red spheres on the ground. The window between the aura grants is so small the boss is impossible to kill.

I believe the spheres on the ground are coded as unique enemies, they seemed to have gained the invincibility aura to allies affect from the scarabs. In the video linked above, you can see that the orb on the furthest to the right is constantly applying the immunity area to the boss.
The orbs don't seem to de-spawn and the boss won't move so they're effectively immortal.