Villagers may be phasing through blocks/floor/walls?

[ErikaRedmark]

I'm having a couple issues with some villagers I have, and it only seems to occur when I am away from them. Sometimes, they somehow get on the outside of a closed structure. The structure itself has no easy access outside, and is in fact floating slightly above the ground. Every so often, I'll come back and find a villager below it, with some damage as if it fell through the floor.

So, I built up the floor so there was solid ground all under the structure.

I just had a situation where now it tells me my villager was killed. I guess she phased through the floor, and suffocated in the ground?

I'm running the latest VillageBox (recently did a big mod update) with a lot of other mods; if needed, I can give you those as well. What's making this bug really bad is that I have villagers set to respawn in config... but they never do. So when I lose a villager that takes a lot of investment, it sets me back quite far. I've tried adding nature totems to every villager home, but the suffocation bug sometimes occurs and there isn't anything I can do to work around that.

Finally, I don't know if this is relevant, but my structures are circular, not rectangular. There are cases where a block is barely kissing another via corner. I don't know if that might have something to do with it? They seem to want to path there quite a lot; I frequently find them pushing themselves into those corners. I'll try filling out the corners of the circle and see if it completely stops the phasing.

Edit: I have one villager, a banker, who I always had in a rectangular building, and corners fully filled. I never once had him phase through. Now, the phasing isn't very common, so I don't know if it is luck, but I've had it happen a few times in every other building with villagers, all circular. The rectangular one never had an issue. I just filled in the corners of the circular ones, and I will add more villagers to the rectangular one to compare. Could be a red herring, but I have a strong suspicion that it has something to do with hollow corners, based on this info and the fact that of all the circular buildings, the one that had the most stuff in it stuck in corners (hence preventing pathing there) had the fewest phasing incidents.