Villagers IA Fail

hello there, I hope you are well
Villagers 1.16 onwards, can not find the path to the beds in the night on specific structures. they start around the house from the walls, but not the entry, and when they reach it [the entry], they out inmediately.
Finally, zombis scare them and they go away from the house until; the dead.
My structure is one block of deep underground, other 2. but not worked. Also, I think that; as my roof is stairs and slabs, they think that they could join "though" it, as if they ignore it because; they stick on it
Good bye & Good luck