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M3 scheduled charging not working after update?

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What amperage are you charging at? Anything less than 24A for the winter will be slow. One time I ramped it down to 16A and charged for 10hours and got barely 50km.

Also, I recommend closing your Tesla app on the phone to avoid any shenanigans.
 
With the "cold weather" updates the charger handle isn't being locked into place anymore prior to actual charging start, so maybe in your case it wasn't fully inserted and therefore couldn't charge. Before the update, you'd have the immediate feedback that the connector wasn't fully inserted because it wouldn't lock in. But now you don't realize. My only suggestion for now is to make doubly sure that the cable is fully seated when you plug it in.