1. What did you expect to happen?
   When nearby blocks are broken, I expect relevant dirt & cobblestone blocks to fall to the ground at a moderate speed.

2. What actually happened instead (i.e. what was the bug)
   These blocks instantly teleport to their destination. I'm hosting a multiplayer server, using the latest version of TFC, and haven't had this issue in single player. This happens even after restarting the server.
   Here's the "fallable" section of my config file. I've edited some parts of it: https://pastebin.com/zyNc0Xe6

To Reproduce
Break stone or grass/dirt in such a way that cobblestone or dirt falls down nearby.

Meta Info
TerraFirmaCraft-MC1.12.2-1.6.1.157

I updated from TFC 1.6.1.157 to 1.7.3.161, skipping several versions in the process. As of 1.7.3.161 or some earlier point, this bug no longer occurs in either single player or multiplayer. 👍