I am a UA MM and have about 15% of the MM status on AS. In my eight years of flying AS+partners I have had to request more retro credit than in my 20+ years of much more frequent UA travel. If they can’t fix this, they should at least (manually) fix the problems it causes when this is requested.

The answer the OP got can be summarized, “we were late, too bad, so sad. We know you have a choice of airlines. Thank you for flying Alaska”