Blocks Dissapearing While Building - 1.20.6

[HobbitForHire]

Issue
When building at any degree of speed, random blocks will unload/unplace. This does not impact all placed blocks, and appears to be random as I cannot find a trend. There is no breaking, the block simply vanishes. This has been tested at low server load. This occurs in LC and out, and according to Ewdrawings also happens on the build server (untested).

Unsure as to cause, but fully replicated on main server

Testing steps:
Enter LC
Place blocks at moderate-high speed

Ticket refence number:
RTS-166437