So digging around it seems like yesterday possibly was not only the Star Vs the Forces of Evil series finale, but also the Milo Murphy's Law series finale.
https://www.reddit.com/r/MiloMurphy..._and_ferb_ends_and_then_milo_murphys/eo1ghuu/
aka they aren't officially cancelled, but production of the series has stopped. It could just be because they are working on a new phineas and ferb movie and they just will let Milo sit until after that when it can draw more people on disney+ but at the very least it seems like Disney hasn't told them one way or another if that is going to happen.
Wow, that really sucks.
Also didn't realize MML only had two seasons, since it's been on for a while. I guess that's Disney scheduling for you.