Custom blocks and furniture are pretty broken and lacks features on lastest dev builds, mc version 1.21.4
crucible custom blocks and furniture are broken now (at least in lastest dev builds)
issue 1: a bug from 2 year ago still exists, custom blocks can be placed inside entities (issue 133)
issue 2: custom blocks will bug doors (and yes i have noteblock updates disabled in paper config)
issue 2.5: if you place door on a custom block it will place only bottom half of the door
issue 3: there are no breaking, step and fall sounds for block (this isnt an issue but this is really lack of feature)
issue 4: it wont generate #inventory texture when using cube_all parent
(log: Missing texture references in model namespace:block/limestone/white_limestone_tiles#inventory: #down #east #north #south #up #west particle
)
same goes with furniture.