Land mobs cannot properly walk on the waterlogged blocks.
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The situation has improved in 19w12a, but when the land mobs walk for a few steps in the waterlogged blocks(like waterlogged top slab), they will stop to rotate, then they will continue walk for a few steps
You can test it again with vindicator or silverfish(In the picture, the dark prismarine are soild blocks, and the sandstone is top waterlogged slabs)

Confirmed for 19w12b

Confirmed for 19w13a

Confirmed for 1.14 pre3

Confirmed for 1.14 pre5