I was working on the Erollisi Day achievement Love is Such A Beautiful Chaos. I needed to get a beholder love note. One did drop in The Nebulous Deep [solo] but the achievement was not updated. Date: 2/19/2023 around 6:25ish (PM) CST
I was able to confirm that looting a beholder love note in "Awuidor: The Neubulous Deep [Solo]" does update the Erollisi Day achievement. I am not sure what issue you may have encountered. ~ Kaitheel