Groundworks

Players

• An Assembly where you may not build, in adventure mode or on protected ground, now tells you so whatever else refuses it, as a Stretch and a Fast Replace do, where before a taken position, a Key that wouldn't stand or the blocks it lacks were told first.
• A torch, a sign, a hanging sign, a banner, a head or skull, or a coral fan aimed at the side of a block is now previewed as the wall one vanilla places there, where before the preview drew a standing or ceiling one. The preview now asks each item for the state it places, as vanilla's own placing does, so a block a pack opts in whose item chooses its own state, such as a command block for a player who may not use it, is drawn as vanilla places it too.

Consumers

• A ReplaceBuilder or LegBuilder plan's clears are now emptied when a Fast Replace or a Stretch lays it, before its blocks go down, as the preview already drew them and an Assembly's always were; before, they were marked and guarded but left standing.
• A LegBuilder leg's clears now reach its Stretch's plan, a later leg's block or clear winning a position an earlier one takes, so the preview marks them and the Stretch empties them; before, a Stretch drawn in legs dropped them, and only a Column kept its own.
• Refusal.Assembly.MAY_NOT_BUILD now refuses an Assembly's plan ahead of TAKEN, KEY_WOULD_NOT_STAND and NOT_ENOUGH_ITEMS, as Refusal.Stretch.MAY_NOT_BUILD and Refusal.FastReplace.MAY_NOT_BUILD already do theirs.