Ghost Blocks Appear more often Also Observers dont send a pulse as quickly as it does in 1.12.X

Ghosts blocks have been a issue for a while. but its gotten worse in the pre-release. Theyve been appearing more often with a fast flying machine in this version. heck even the ghost blocks affected the

Flying machine.

 While facing this problem I noticed observers don't update as fast as it does in 1.12.2