The bug
Shift-clicking water buckets against a waterloggable block doesn't place the water against the waterloggable block.
Example
[media]
→ ❌ Shift-clicking the water bucket against the slab should place the water on the redstone block, like it would when shift-clicking a bucket against a cauldron.
Linked issues
is duplicated by 3
relates to 5
MC-131021
When placing water or lava on top of a top slab, the slab is waterlogged / the lava is not placed
Resolved
MC-126906
Buckets cannot be emptied against blocks with the state waterlogged
Resolved
MC-127110
You can't empty water buckets into waterlogged blocks
Resolved
MCPE-115414
Sneaking does not prevent the player from waterlogging blocks
Reopened
MC-273722
Shift-clicking unlit campfires, candles, or candle cakes while holding flint and steel or fire charges doesn't place the fire beside the said block
Resolved
Might be hard to fix or just wai. Notice that you need to shift click to waterlog chest without opening it.