SMW Memory Map
|$7E1419||1 byte||Sprites||How sprites enter pipes with the player. This handles carried sprites and riding yoshi, and is always set regardless whether or not the player is carrying a sprite and whether or not is riding yoshi. When this RAM is set to any non-zero and the sprite is being carried and/or yoshi is being ridden on, they're placed behind layer 1 and yoshi's tongue is not shown (when licking).
Note: Yoshi always show his pipe animation pose regardless if the player is mounted on Yoshi or not, consider using this patch to fix it.