Armor stands' x-rotation tends to move towards 0

The bug:

An armor stand's x-rotation will move towards zero over the course of a couple of ticks, mimicking other mobs. This differs from the behavior exhibited in Java Edition, where the x-rotation remains the same and does not change.

What I expected:

For the armor stand's x-rotation to not change. It should retain the value it was set to, just like a boat.

What happens:

The armor stand's x-rotation moves towards zero over the course of a couple of ticks.

Steps to reproduce:

• Summon a new armor stand:

/summon armor_stand ~ ~ ~

• Have the following in a repeating command block:

/execute @e[type=armor_stand,c=1] ~ ~1 ~ particle minecraft:basic_flame_particle ^ ^ ^1.5

(To illustrate where the armor stand is currently looking)

• Teleport the armor stand to itself with a change in pitch:

/execute @e[type=armor_stand,c=1] ~ ~ ~ teleport @s ~ ~ ~ ~ -90

→  The armor stand's x-rotation will quickly lower to 0.