if you break a block under water, there is a chance it wont float up.
to recreate simply break a few blocks under water.
Linked issues
Comments 1
MC-152055
some items don't float
Resolved
Duplicate
0
Silje Uglenes
(Unassigned)
Unconfirmed
Items
Minecraft 1.14.2 Pre-Release 1
Retrieved
Duplicate of MC-134145. Items can only float upwards in water source blocks. If the water is flowing downwards, it'll push the items down.