Deliriousness % not increasing between maps in Trial of Madness

I'm running maps inside the Delirium fog (Trial of Madness), but my regional Deliriousness % is not going up from one map to the next. It stays stuck at the starting value.

What I'm doing:

Spreading the fog from a map on the Atlas
Running maps that are inside the fog
Killing rare monsters and the map boss
Despite this, the Deliriousness does not seem to increase across maps.
Anyone else seeing this on 0.5?

I am currently having the same bug. It is super frustrating. I started a new fog area and the same bug applied