I actually saw two or more villagers getting into their house at one time and when they do that they bump into each other and not go through the door. I usually solve that by pushing them in, but I still think it's a bug.
Linked issues
duplicates 1
Comments 3
@Michael It most definitely exists in 1.16 RC1. Villager AI has not been touched in any meaningful way through the 1.16 snapshots, pre-releases, etc. Their poor pathfinding, workstation stealing, door struggling, over breeding bugs are beyond frustrating (all have been reported here, thankfully).
Please check if this is still an issue for you in 1.16 Release Candidate 1 or later.