When entering a tent wherein another entity, player or mob, is standing in front of the inner door of the tent, it can cause the entrant to be displaced and end outside of the tent, where they then fall into the void.

Both myself and another were able to reliably recreate the issue, however possibly due to other mods we fell endlessly, looping through the void near the tent until we entered Creative to stop falling, then Spectator to move back into the tent, then reverting back to normal in order to continue to enter and exit the tent normally. The tent seems to operate as intended as long as no entity is directly near the doorway inside the tent, and multiple parties can then enter and exit as should be intended.

If any more information is needed, just let me know, and I'll do whatever I can to help!

I can confirm this as well, exact same issue.

I also keep getting this. I've also had instances of some users on a server falling into the void when logging onto a server when users were last in the tent before their previous log.
Not sure if a simple solution would be to generate full chunk under the tent to give a bit of a buffer from the void.

also had this one time when some pillagers snuck in... I thankfully keep cheats on to fix/alleviate bugs while pack making so managed to salvage the situations with creative before I hit the bottom. :V

this is an ongoing problem