Reward not spawning in Valdo Map

Bug Description:

In some Valdo Maps that contain an Abyss, after completing the map and finishing the Abyss mission, the reward chest does not spawn. The Abyss encounter works normally, but the final reward chest simply never appears.

Details:

Happens specifically in Valdo Maps with Abyss.

The encounter completes correctly, but the reward chest never appears.

It seems related to certain map layouts. I was running a Necropolis Map, which may have prevented the chest from spawning.

I would appreciate it if you could look into this, as it has been happening for a while.

Thanks.

Bug reference number: 3.476.840.721

Same thing happened to me today.
Necropolis map with abyss complete required.
0 monsters remaining and abyss trove opened, no reward.

Just happened to me on a Mask Of the Stitched Demon map. For what i have seen around its a common bug but looks like ggg is not doing anything about it.