Blocks that are supposed to connect (like some kinds of Factory Blocks) do not connect or connect randomly and change the way they are connected after placing a block nearby (the easiest way to recreate), walking or sometimes just looking at these blocks.

Example 1, before placing a torch:

Example 2, after placing a torch:

This seems to be caused by Sodium, which is adding nondeterminism to block rendering. CTM requires consistent access to the underlying world. Report this to sodium.