Me house be under water! https://i.imgur.com/F1YlX1u.jpg Yo, Imma sue you! They're leaking everywhere....

Pretty sure any ceiling leaks if it's only one block thick.

Hm..no, not really. If I saw a block in half and have a "slab" of sorts from ForgeMultiParts for example, then it doesn't leak.

Seems to be a carpenters block issue.

It's definitely not an issue, that's very much normal.

Indeed.. I model the block characteristics around vanilla behavior.