Entities stop sinking 1/3rd of the way through waterlogged cobwebs

When sinking through a cobweb, entities stop sinking / start sinking incredibly slowly. I noticed the bug while building a Drowned farm, then tested it out in a Creative world. Mobs capable of movement will stop sinking completely, while the player (if not trying to move) will slow down so much that the movement is undetectable unless you are using a reference point.