I keep seeing what seems like the same error, posted on open.rocket.chat.
For reference, heres another post about this
I am on Docker, Mongo 5.0.5, RocketChat 4.4.0
Most imports fail for me.
I tried to manually craft a lot of different Versions of the .zip containing the exported files.
When the zip only contains users.json with a few users it imports these successfully - but sometimes that fails too. With messages there’s almost always errors.
But I’ve also had one channel imported without errors and messages just not show up afterwards multiple times.