Map Modifier: "Area contains the Immured Fury" does not correctly spawn the boss

I full cleared two Tier 5 Waystones one after the other with the modifer "Area contains the Immured Fury" and it did not spawn in either of them. In one of them I killed the boss before full-clearing and in the other I full cleared before killing the boss. Neither had an effect on the boss spawning or not.

Also had this happen. Reference # 488,706,623

Can confirm this has also happened to me twice today.

Same, I've had 2 maps where it hasn't spawned.

Have had 3 maps with no boss spawn too.

+1, full cleared the zone, no immured fury spawn.

2 Maps ran this league so far with immured fury failing to spawn.

Reference # 1,682,948,535

GGG address this shitty bug pls?

Had this buy happen to me 2/2 times i tried. Map clearly says Contains the Immured Fury. I checked each map 3 times everything explored and no sight.

Same here. Just ran my 4th map still no immured boss.