The Bug:

Goats do not see big dripleaves as an obstacle when attempting to ram an entity.

Steps to Reproduce:

• Place down a line of big dripleaves.
• Spawn a goat on either side of the big dripleaves.
• Stand on the other side of the big dripleaves and wait for the goat to ram you, or you can use the following command to make it 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 goats do not see big dripleaves as an obstacle when attempting to ram an entity.