CTM has non-connected textures on glass. 1.15.2 OF Preview G1_Pre2 · Issue #130 · modmuss50/OptiFabric · GitHub
Seamless glass (No optifine required) Minecraft Texture Pack
Borderless Glass - Minecraft Resource Pack
Optifine 1.16.5 connected textures not working with custom resource pack - Resource Pack Help - Resource Packs - Mapping and Modding: Java Edition - Minecraft Forum - Minecraft Forum