I haven't been able to figure out if this is a Google issue or King County Metro issue yet, but google maps transit directions are completely broken today. Every suggestion is "take Lyft" or wait until 4 am tomorrow.
I played around with it a little on google maps. It says it pulls route information directly from the King County transit website[1] which lists routes by the day of the week, not by the date, and seems to be displaying the routes for today just fine. My guess is that it's a Google issue, but maybe the King County transit website was broken earlier today and gmaps is just serving the cached routes now.
For anyone curious, this is what it currently looks like to get from Bellevue to Redmond in google maps.
https://i.imgur.com/wMTIzBL.png