Is an issue for all directional co-ordinates executed as an arrow.

Screenshots were all taken by firing an arrow into a block and running the following command:

/execute as @e[type=arrow,limit=9,nbt=\{inGround:1b}] at @s run summon armor_stand ^ ^ ^5 {NoGravity:1b,Marker:1b,Invisible:0,Tags:["A"]}

Expected behaviour:

Command would result in the arrow always pointing towards the summoned armour-stand.

Current behaviour:

Arrow only points towards summoned armour-stand in the Z direction

Arrow only points directly away from the armour-stand in the X and Y direction

Instructions to replicate

1. fire an arrow into a block
2. Run the following command:

/execute as @e[type=arrow,limit=9,nbt=\{inGround:1b}] at @s run summon armor_stand ^ ^ ^5 {NoGravity:1b,Marker:1b,Invisible:0,Tags:["A"]}

NOTE: Directional co-ordinates appear to work correctly when executed as any other entity.