Go fly somewhere looking in some diagonal direction
armor stand gains my position as well as my facing rotation
armor stand gains my position but preserves its existing facing rotation
It appears that currently teleport is bugged so that the rotation arguments (4th and 5th arguments of that teleport 'overload') use the sender's rotation rather than the context's rotation. You can see that with e.g.
which does change the facing. As well as
which still gains my facing, not mine+20.
To be clear, here is what I imagine makes the most sense for teleport:
After this bug is fixed, you would have an armor stand keep its location but gain the facing rotation of the player with
Possibly a duplicate of the more general