[42.13.1] Quitting as host of multiplayer save frequently voids items on the floor

[silent adder]

Mode: Multiplayer
Sever settings: Host
Mods: None
Save: Save we've been playing for the past two weeks
Reproduction steps:

1. Place any loose item or backpack on the floor, either with the "place" command or by dropping to the floor
2. Shut down server using either "Quit" or "Quit to Desktop"
3. Re-host server and load into world
4. Entire backpacks full of items and loose items on the floor will now be gone mostly at random, but especially if they were dropped just before the server was shut off (from 20 minutes to seconds before seem most likely)

While it seems very likely to be a saving issue, I think it's particularly the server not saving on its own often enough if at all, and then the quit buttons kill the server processes before they're done saving all the data. We've lost hundreds of items which we can only loosely remember and then item list viewer back into existence to the best of our memory. I didn't even know of the existence of the save command as the host until I looked it up after our entire server world got wiped when my computer crashed.