Vaal Chamber - High Priest Rare invincibility bug

There is a bug in the Vaal chambers, where some of the maps that Spawn the High Priest Rare enemy can cause then to get stuck on the terrain when performing their underground movement ability.

It seems to be a weird interaction where if they travel towards an object like a bench, or some bricks, their model can get stuck to that element whilst still underground and invulnerable.

If you walk on top of the "tunnelling" animation, you still take damage, and the game will show the name of the enemy when hovering over the animation.

Abilities like Explosive Spear, that can stick in the ground and do AOE damage does not damage the rare.

In a single Vaal Chamber map, I've had two of these Rare's spawn, and both have the same problem. (Another thing is these enemies can tunnel outside the room, which completes the room, but they can still get stuck on terrain in another room.)