A dispenser will drop water on soul sand, but will not pick the water back up, instead it throws the empty bucket out of the dispenser.
MC-129361
Dispenser throws out empty bucket instead of picking up water on soul sand
Resolved
Fixed
1
(Unassigned)
Confirmed
bubble_column, bucket, dispenser, magma_block, soul_sand, water_bucket
Minecraft 18w19a, Minecraft 18w22b
Minecraft 1.13.1
Retrieved
Appears to be fixed somewhere between 18w22b and 1.13.1.