Slabbed

First Slabbed build for Minecraft 1.21.4 (part of the promised 1.21.2–1.21.10 range). It carries the full feature set of the 1.21.1 line: placement heights are recorded where you aim and kept for good, lowered slabs support the same objects, rails slope to meet their neighbours, fence posts meet a nearby slab ceiling, hung decorations keep their seat.

Needs Fabric API 0.119.4 or newer (the renderer API this build draws lowered blocks through).

• Pale moss carpet, new in 1.21.4, follows the same rules as the other carpets on lowered slabs.
• The Minecart Improvements experiment is not covered: with it enabled, carts ride at vanilla height over lowered rails. Item frames keep the 1.21.1 line's behaviour (no render drop for frames without a remembered seat).
• The 1.21.2 game refactors (block neighbour updates carry a wire orientation, minecart movement moved to a controller, redstone wire power moved to a controller, entity renderers work from render states, world events moved to their own handler) are followed where Slabbed hooks them; behaviour is unchanged.

This is an alpha. If anything misbehaves, please open a report at https://github.com/peetsamods/slabbed/issues with your game version, loader and Slabbed version.