The bug
When you place a bucket of water on a top slab, the water is placed inside the slab instead of above.
Example
Here is an example in video: https://www.youtube.com/watch?v=5gcZIO6C74k
Additional information
This bug causes that you cannot place lava over a top slab.
Linked issues
is duplicated by 18
MC-131140
Put water on up-slad.
Resolved
MC-131843
Unable to place water on top or against slabs/stairs
Resolved
MC-131894
Lava unplaceable on top half-slabs, side of double half-slabs or signs
Resolved
MC-134891
Placing water on a solid face of a partial block (eg. stairs and slabs) fills the block instead of placing water above it
Resolved
MC-136241
Stairs ignore direction of water being placed on top
Resolved
relates to 4
MC-126906
Buckets cannot be emptied against blocks with the state waterlogged
Resolved
MC-173730
Shift-clicking water buckets against a waterloggable block doesn't place the water beside the waterloggable block
Open
MC-142958
Water disappears when placed on double slab
Resolved
MC-171629
Right-clicking empty bottle on slab above water level creates water bottle
Resolved
Attachments
Comments 14
Affects 1.13-pre2
Affects 1.13-pre3
Can confirm for 1.13-pre4.
Double slab bit fixed in 1.13-pre5, top slab issue remains.
Top line affects 18w49a, everything else remains fixed
Video recording of water and top-half slab bug: https://www.youtube.com/watch?v=5gcZIO6C74k
This ticket should probably be split up, so that we have one ticket for lava not being able to be placed, and one ticket for waterlogging while looking at the top face of a top slab / bottom face of a bottom slab.
Lava can be placed without any issue in 1.16.2
This is probably intended, that just is how waterlogging works. If you right click a waterloggable block with a water bucket, the block will be waterlogged and if you place it by aiming at the corresponding side, it will also be waterlogged. I don’t think, this is a bug.
Confirming for 1.13-pre1.
I suspect the water aspect of this might be intentional? For lava though, and for double slabs. it makes no sense.
Also, this seems to be related to MC-126906.