The bug
Water buckets and lava buckets cannot be placed against blocks with the waterlogged=true
state. Note that for chests, you already need to use shift-click to place water inside the chest, so allowing shift-click to place blocks against waterloggable blocks does not entirely fix this issue.
Steps to reproduce
Place a
[media]waterlogged=true
block, for example a slab:
Right click on the top face of it to place water:
[media]
→ You'll see that nothing happened.
Note: This also affects double slabs, even when they are not in water.
Linked issues
is duplicated by
relates to
Attachments
Comments

The lava bucket cannot be used to place lava in or against any block that can have the waterlogged state. Clicking and shift-clicking both do nothing.
Confirmed this also affects version 18w16a

Yeah this is troubling... it's strange, especially for double slabs, where water cannot even be part of the block given that it takes up the full 1 m^3, but you still can't place water on the block, on any of its six faces.
For lava bucket in 18w19b, I cannot place lava adjacent to and when clicking on: stairs, (double) slabs, fences, walls, chests, trapdoors, ladder, sign, item frame. Regardless of shift.
The chests are always opened.
For ladders there is bucket animation.
For Item frames the bucket is placed into it.
This is inconsistent considering that shift is used with placing adjacent to the targeted block, so as to not access or change the target.

Affects 18w20a
I have not personally checked this bug, but have noticed that the screenshots are taken in creative, which buckets don't empty in creative anyway.
@FusionLord The problem is not that the buckets don't empty, it's that they don't get placed at all.

Affects 18w20b
still can't place water ontop of a double slab in 18w21a

Affects 18w22a

Affects 18w22c

Affects 1.13-pre1
Still an issue in 1.13-pre2

Affects 1.13-pre3

Please check the Affected Versions before commenting; the change has already been made.
I just added it 🙂
EDIT: no I didn’t, confused it with a similar ticket.
This bug is still in the bedrock Edition MCPE-59107.
Water is now placed IN those blocks. But true, it should be able to place ON them WITH SHIFT pressed. That would be intuitive.
Also this bug affects lava bucket.