Versions

Betweenlands version:

3.7.1

Forge version:

Whichever one comes with the mod pack on the Betweenlands community server

Singleplayer or Multiplayer:

It happened to me on the Betweenlands server

Installed mods:

The Betweenlands server mod pack

Description of the problem

How to reproduce:

1. Place a simulacrum
2. Mine the block under it
3. The simulacrum will cease to exist

Expected result:

I expected the simulacrum to either drop or stay in place

Actual result:

It instantly vanished and was gone forever