Lightless Astrolabe failing due to "long" Abyss duration

I've failed MANY Astrolabe objectives due to Abysses slowly - seemingly unending- spawning monsters - trickling out 1 by 1.
I'm instantly killing everything, but they come out so slowly that the Abyss will simply close and mark the objective as failed.

Please do fix this, or simply ensure that at least 1 Abyss be completed per map for the mechanic to work.

It sucks doing 3 effortlessly only for the 4th to bug out and ruin everything.

Same issue here. Sometimes the Abyss just has no more space to travel further and stops its run which bricks the Astrolabe bonus.
Would be nice if, for example, in such cases abyss would behave as it does in Mirages where it spews all the monsters at once in one spot.

also sometimes they just keep spawning monsters that grant neither xp nor loot. i stood afk next to one letting my minions kill the mobs once and it just didnt stop. in that case they also cant be completed.