Lazy pandas sometimes rotate their entire bodies vertically when looking at the player while laying down

When lazy pandas lay down, they can rotate their head and their bodies horizontally, which is likely intended. However, they can also rotate their bodies vertically while laying down randomly or when tempted with bamboo, which looks very odd.

To reproduce, use the following command to summon lazy pandas, pillar up a couple blocks, and tempt them with bamboo:

/summon minecraft:panda ~ ~ ~ {MainGene:"lazy"}