Hello!
Also, the blocks disappear on my server.
The server is local, we play only with a friend.
KCauldrone 1.7.10-1614.201
gregtech_1.7.10-6.11.04
All the missing blocks are tileentity: bushes with berries, pipes, mechanisms and others. In all cases, the environment is different, as is the position in the chunk: only grass is nearby - below, a wall nearby or something else.
I did not find anything in the logs.