The bug
Be on the surface of water, look down, and right-click with a lily pad. The lily pad will be placed intersecting the player, which is not possible with normal solid blocks.
It is easiest to test this by standing in one-block-high water, but it works no matter the depth. Both Survival and Creative mode.
Also, if you stand on the edge of water (half on a solid block, half on water) and place a lily pad, then move out towards the lily pad, you will get the jumpy "stuck in midair" effect. Presumably this is due to client/server disagreement on whether you're on top of or falling through the lily pad.
As of 19w14a, placing a lily pad within yourself will also trigger the crawling animation.
Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
Placing lily pad on side of block
The class BlockLilyPad does not override the method net.minecraft.block.BlockBush.getCollisionBoundingBox(IBlockState, IBlockAccess, BlockPos) which returns no collision box.
Placing lilypad without looking at block
The method net.minecraft.item.ItemLilyPad.onItemRightClick(World, EntityPlayer, EnumHand) does not test at all if the block can be placed there or if entities (method World.mayPlace(Block, BlockPos, boolean, EnumFacing, Entity)).
Linked issues
is duplicated by 4
MC-42250
Placing a lily pad in the same block as the player causes jittering upon moving
Resolved
MC-165859
Special placing of a lily pad lets you fall of a block while sneaking
Resolved
MC-172703
Place lily pad and break instantly when right clicking boat in survival
Resolved
MC-173029
Can place lilypads through boats
Resolved
relates to 5
MC-11242
When you jump and place a fence post under you you will get inside the fence post
Resolved
MCPE-32638
Lily pads can be placed inside players in a confined space
Resolved
MC-221278
Lily pads can instantly break when placed near immobile boats
Open
MCPE-112516
Lily pads can be placed inside entities
Open
MC-112516
Current Language: ~~ERROR~~ NullPointerException: null
Resolved
testing discovered 1
Attachments
Comments 68
Is this still a concern in the latest Minecraft version 14w30c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
As of 1.15.2, sneaking on the edge of a shore still allows for unresolved placement of an intersecting lily pad.
The resulting state exhibits some incongruencies:
For the acting client, their self is shown as standing, regardless of input, while their BB remains in a sneaking state.
For peers, both their model and BB are stuck sneaking. Following a server restart, this switches to standing.
Regardless, sneaking input by the actor is reflected in their nametag opacity.
[media]
mgatland
Separated this ticket from MC-2208