Thanks for sharing this, it does seem like european payments do slip through the regular processing. My speculation is that it’s because it is not a FPS or BACS transfer as @anon44204028 mentioned.
I can’t think of who exactly to @ in from the Monzo team for comment. Last post I read, @leah was the one who normally did the processing of them but if that’s not the case, @Naji, could you find the right person to escalate this to?