placement-and-support issues
MC-9591Players are able to create ghost lily pads
Fixed
MC-31168Fire cannot exist on the sides or bottom of non-flammable blocks, even though it can on the top
Confirmed
MC-70057Can't place redstone on sea lantern
Fixed
MC-86978Sideways placeable blocks placed on the side of replaceable blocks are positioned sideways, rather than straight up
Low
MC-106860Some things can't be placed on End Rods
Low
MC-118501Many plants and other blocks behave oddly when blocks are placed on them
Confirmed
MC-133691Blocks can't be placed normally on a full cauldron
Fixed
MC-136405Lily pads and frogspawn cannot be placed when not aiming at water
Low
MC-146564Buttons and levers cannot be placed on top of or underneath walls
Confirmed
MC-146825Red and brown mushrooms can't be placed on top slabs or stairs
Low
MC-146941Torches, sea pickles, lanterns, and pressure plates can be placed on top of bells
Confirmed
MC-147248Wall torches cannot be placed on the sides of lower slabs or stairs
Confirmed
MC-147249Bells cannot be placed on the sides of upper slabs, stairs, the side of a piston base, or the stone side of floor bells
Low
MC-147252Bells cannot be placed on top of cauldrons, composters, hoppers or other bells
Invalid
MC-147253Buttons and levers cannot be placed on top of filled end portal frames
Confirmed
MC-147531Buttons and levers cannot be placed on top of grindstones
Low
MC-147551Doors placed on trapdoors pop off when the trapdoor is opened, even if the door would be supported / Cannot place doors on other doors
Works As Intended
MC-148901Torches, sea pickles, lanterns, and pressure plates can be placed on top of fence gates
Confirmed
MC-157300Trapdoors can support some blocks when open
Normal
MC-160418Paintings can be placed inside nether portals, while vines can't be
Confirmed
MC-163196Several blocks which can be placed on the sides of slime blocks cannot be placed on the sides of honey blocks
Low
MC-163248Rails cannot be placed on honey blocks
Low
MC-165247End crystals can't be placed on burning bedrock or obsidian
Confirmed
MC-165404Scaffolding can't be placed on honey blocks
Low
MC-167420Attempting to place paintings or item frames against invalid blocks does not immediately default to other potential valid placements
Confirmed
MC-168262Dead bushes cannot be placed on farmland
Low
MC-168264Sugar cane cannot be placed on farmland
Low