Abysses bugged + challenge

Hi,

I use T16 map, sextant +2 abysses, map device options with abyss and winged scarab for +3 abysses. My map spawns between 6-8 abysses. only 20% of the abysses spawns rewards chest rest do nothing. Also cannot complete league challenge. My atlas passives are: Underground kingdom, Abyssal army, Lightless legion and Awakened depths.

I open 1 abyss at the time and complete it, I kill all monsters, but reward chest isn't spawning most of the times.


UPDATE:

Challenge completed. But bug persists with abysses not spawning chests at the end, the case seems to be linked with abysses not spawning Rare monsters. After completing like 15 abysses, I saw that some of them at different stages stops spawning Rare monsters and then after some time abyss bricks.