I was creating a portal gun and I wanted the player to appear in front of the orange portal (Blaze) instead of teleporting inside it. I made it so when you shot the gun, it would spawn an armor stand with a tag of "haha" on your location. When the blaze spawns, a teleport command would hold him in place while also having him face the armor stand. This would hopefully allow me to teleport the player in front of the blaze.

However, when doing the following teleport command:
/execute @e [type=blaze] ~~~ /tp @s ~~~ facing @e [type=armor_stand,tag=haha]

The blaze ignored half the command and looked everywhere else but the armor stand. What's even weirder is my blue portal (Vex) didn't move its head when it was constantly teleported WITHOUT THE FACING EXTENSION! Players can't turn their heads when being teleported to themself and it seems like vexes behave like players, and blazes don't. Strange.