Achievement "Dream within a Dream" not working - Bug ID 4069819023

Hello. I've dropped a unique map while being inside a unique map in "Keepers of the Flame" league, but the achievement "Dream within a Dream" didn't trigger.
Bug Report ID: 4069819023
I used the /recheck_achievements command after the drop and when I picked up the card, but it didn't help.
Please fix this.