The Bug:

Goats will not attempt to ram entities on waterlogged top slabs.

Steps to Reproduce:

• Place down a large area of waterlogged top slabs.

/fill ~15 ~-1 ~15 ~-15 ~-1 ~-15 minecraft:oak_slab[waterlogged=true,type=top]

• Spawn a goat on the slabs.
• Use the following command to make the goat ram you:

/execute as @e[type=minecraft:goat,limit=1,sort=nearest] run data modify entity @s Brain.memories."minecraft:ram_cooldown_ticks".value set value 1

• →  Notice how the goat will not attempt to ram you, despite you altering its data to force it to do so.