Screenshot talks itself..
By sides there are full blocks, and textures are connected.
Meanwhile at center is Little Tiles (1-2 "px" boldness) and no any texture connections. Makes view really awful :(

Here is related stuff used:

continuity-3.0.0+1.21.neoforge.jar
connector-2.0.0-beta.7+1.21.1-full.jar
LittleTiles_BETA_v1.6.0-pre161_mc1.21.1.jar