Armor Stand passengers rotation displays incorrectly

Can confirm for MC 1.12.1.

Happens in 18w20c too.

Confirmed for 1.13.1.

Updated commands (1.13+): /summon armor_stand ~ ~1 ~ {Passengers:[{id:"armor_stand",CustomName:"\"TestStand\"",CustomNameVisible:1}]}
/data merge entity @e[name=TestStand,limit=1] {Rotation:[180f]}

Confirmed for 1.14

And for 1.14.1.

Confirmed for 1.14.2

If you set the motion of the armor stand in the same tick as the rotation, this bug is 100% reproducible every time:

execute store result entity @e[name=standEntity,limit=1] Rotation[0] float 0.001 run data get entity @p Rotation[0] 1000
execute store result entity @e[name=standEntity,limit=1] Rotation[1] float 0.001 run data get entity @p Rotation[1] 1000
execute store result entity @e[name=standEntity,limit=1] Motion[0] double 0.001 run data get entity @s Motion[0] 1000
execute store result entity @e[name=standEntity,limit=1] Motion[1] double 0.001 run data get entity @s Motion[1] 1000
execute store result entity @e[name=standEntity,limit=1] Motion[2] double 0.001 run data get entity @s Motion[2] 1000

If you execute this function as a moving entity, the armor stand will copy its velocity but will not visually update its own rotation. If you display hitboxes, the blue line is pointing in the correct direction.

confirmed in 1.14.4. For me it seems to rotate twice in a row just fine (rotating 90 degrees at a time), the third time the visual issue occurs, then it repeats.

Confirmed 1.15 pre-4. Might want to change the title to indicate it only happens with passengers.

Confirmed in 20w21a. Relates to MC-110008