Its as if the writer at Larian who did the ending scenes has never played the game isn't it?
Sees 'Vampire' and writes an ending scene with no understanding of the character progression whatsoever and absolutely not one iota of empathy for either the player or Astarion himself.
Or has very clear preferences and doesn't like Astarion (and Shadowheart). I'm still salty that the game didn't even give me an option to not run to Karlach when she started burning. But Astarion? Who cares, apparently.
I don't have a save with spawn Astarion that is close to the ending so I can't check, but it's not in the patch notes. However the fact that they added some new lines before his kiss animation also isn't in the patch notes, so who knows.