Teleport ignores facing if there is no change in position

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at changes position and rotation, which is overriding the rotated as

Really? Then please explain why these two produce different results:

/execute rotated as @p at @e[name=WandRay] run teleport @e[name=WandRay] ^ ^ ^ facing ^ ^ ^1 < no rotation happens

/execute rotated as @p at @e[name=WandRay] run teleport @e[name=WandRay] ^ ^ ^0.01 facing ^ ^ ^1 < rotation happens

The only difference between those two lines is the Z coordinate of the teleport command. Now either both of these should fail in teh same way with respect to rotation or neither of them should. The fact they both produce different results shows there is a bug in how that is being handled. Maybe it's in teleport like I suspect, maybe it's in execute and neither of these should produce any rotation.

Thinking on your description of the override behavior, neither should produce rotation.