When I try to put a schematic underwater it does that. I built it on land but i want to build it again in a survival world (and underwater), but it keeps doing that, how I know wich block is wich?

In the Visuals config category, enable both ignoreExistingFluids and renderCollidingSchematicBlocks to be able to properly see schematics under water.

In the Visuals config category, enable both ignoreExistingFluids and renderCollidingSchematicBlocks to be able to properly see schematics under water.

It worked, thanks! :D