Overrun Abyss molten vault map bugged

The entire map was empty. There were 3 abyss pits total. The only monsters that spawned were monsters at the 3 abysses and the vaal temple monsters. Killing the abyss monsters did not give additional monsters. The boss did spawn.

Had the same issue, plus tablets guaranteed 3 additional abys, where I had only 2 pits on this map sadly :(