No Eater of world altars with Fortune Favours the Brave

As stated in the title, i noticed today that when i select Fortune favours the brave on my map device it blocks the eater of world altars from spawning. It does trigger the eater of world influence and mob spawns.

Edit:

I've tested this by running 2 maps with Favor and 2 without. (all sewer map)
The ones with Favor both didn't spawn altars.
The ones without Favor spawned altars the moment the eater minions spawned.