You blew the spider gears, period. If you continue to drive it you'll window the case, don't know how big a deal that would really be. A complete new around 800, and gears & bearings w/seals is more. I wouldn't let it make me walk, I know that. It could cause a axle to break when it binds up before it opens up the case though.
The reason these are breaking is because the material Yamaha makes the gears out of is junk, it's Sintered metal, that's powdered metal that's heated till it bonds. It's more like pot metal instead of billet and it's weak but cheap. If you treat it like you know it's weak, it'll last. If you go full retard or run around locked up or wheel hopping, it'll break.
If your under warrantee, they should fix it. Relhok, a forum member broke 3 on his 19 before going a different route, and the dealer warrantied all of them. THREAD: 2019 SS SE, third front diff broken this year .
There is a upgrade from "proformance motorsports" in Australia, it's bad-ass, but it's like 7 grand unless you want the complete rear-end, tip to tip then it's like 12K. Don't get screwed by one of these Co.'s that are selling a pretty billet case with OEM gears in them, their no better than the one you broke. So until someone machines some real gears out of billet we'll have to deal with the Easy Bake Oven gears, you young'uns wont get that, you didn't have toys that would put you in a burn unit. Unless you blow the big wad and go down under. I think a substantial upgrade at a affordable price is in the works.