[MC-70188] Some blocks cannot be placed facing a wall with /setblock or /fill + datavalues or block states

When using /setblock to place a dispenser with a rotation datavalue, if the front of the block is against a wall the dispenser will point the opposite direction when placed.

To Replicate: Place a block. Attempt to spawn a dispenser one block north of it, with a rotation data value of 3 (Telling the dispenser to "look" south). The block will instead face north. Same happens for east/west.

Affects the following blocks:

dropper
dispenser
observer ❓ (can't see due to MC-108054, may be affected if that's fixed)
(lit_)furnace

Code analysis by @unknown can be found in this comment.

Linked issues

is duplicated by

MC-80124 When using /setblock to place dispensers, unable to place facing block

MC-108184 /fill with blockstates only uses state for one block and not the rest

MC-128878 Dispensers and droppers rotating then rotating back

relates to

MC-31365 /summon and /setblock cannot specify chests, furnaces, dispensers, rails and droppers orientation

MC-106638 Loading structures when facing different direction rotates some blocks

MC-108054 Observer rotates when being udpated, moved and then reloaded

Comments

Aerotactics 2014-09-01T11:50:21Z

Confirmed.

qmagnet 2014-09-01T15:08:39Z

Possible related to MC-12437

ddavid135 2014-11-21T23:57:31Z

Hi Q!

Torabi 2015-02-07T16:05:15Z

Cannot reproduce in 1.8.2-pre6, resolving to MC-31365.

marcono1234 2015-05-06T12:22:23Z

Confirmed for

1.8.4 (tested and because of MC-80124)

marcono1234 2015-09-12T15:12:54Z

Confirmed for

15w37a

marcono1234 2016-04-03T10:37:59Z

Confirmed for

1.9.2

marcono1234 2016-04-03T10:38:55Z

Please link to this comment in the description

The following is based on decompiled version of Minecraft 1.9 using MCP 9.24 beta. All method and class names are the names used in the decompiled version.

The reason why this happens is because the method net.minecraft.block.BlockDispenser.setDefaultDirection(World, BlockPos, IBlockState) is called after the block was placed. This means the method is also called when a player places a dispenser, despite the fact that afterwards the method net.minecraft.block.BlockDispenser.onBlockPlacedBy(World, BlockPos, IBlockState, EntityLivingBase, ItemStack) is called which uses the old rotation again.

James Ryan Friz 2016-06-17T10:08:32Z

Confirmed for 1.10

Also tested with fill command and got the same result. The command should have placed six droppers facing north. The first two had stone north of them and faced south instead. The next three had air and faced north. The last one had glass and faced north.

Daniel Burnett 2016-10-03T09:15:19Z

Can confirm in 1.11 snapshots easily using blockstates: /fill ~ ~ ~ ~2 ~ ~ minecraft:dropper facing=west will have two droppers facing the wrong direction.

tryashtar 2017-04-21T02:34:22Z

Confirmed up through 17w16a.

Arcensoth 2017-05-28T15:02:29Z

Confirmed for 1.12-pre5. Also happens with structure blocks.