Scaffolding breaks when placed on some blocks

The bug

Placing scaffolding on some blocks will result in the scaffolding breaking.

Affected blocks

^{List may be incomplete}

• Fence

• Cobblestone Wall

• Chests

• Sign

• Slab

• Flowers / Crops

• Redstone

• Lever / Button

• Trapdoor (Closed)

• Lectern

• Rails

• Cactus

• Player heads

• Grass Path

• Flower Pot

• Enchanting Table

• Beds

• End Rods

• Torches

• Pressure Plates

• Daylight Detector

• Banners

• Brewing Stand

• Turtle Eggs

• Conduit