The bug
So if filled cauldrons act like water and can put the player out when they are on fire, shouldn't the player also be able to use their riptide trident when standing in a filled cauldron?
Linked issues
is duplicated by 11
MC-148621
The sea grass holds water and does not let it run
Resolved
MC-148622
I cannot use the Trident with riptide when I'm inside a cauldron full of water
Resolved
MC-167392
Riptide doesn't work in full cauldron
Resolved
MC-177198
Cannot use riptide trident while in a cauldron of water
Resolved
MC-190106
Riptide in a Cauldron
Resolved
6 more links
relates to 4
MC-106813
Endermen, striders, blazes, snowmen, and bees don't take damage when inside of water cauldrons
Resolved
MC-203565
Striders don't get warm in lava cauldrons
Resolved
MC-93111
Witch sound text don't appears in subtitle (death,hurt,etc)
Resolved
MCPE-93111
Riptide does not work when inside a cauldron filled with water
Resolved
I am pretty sure this should be easy to fix; many waterlogged blocks have similar behavior to water when using riptide, and any cauldron with a state above 0 (with water) should allow the riptide trident to be thrown.