Side note. One of the advantages of using proprietary packaged software is supposed to be a unified support and product. In this case the maintainer redirects the issue to some other team and passes the ball as if it were an open source project with 50 dependencies with thin responsibilities "no, if there's an issue with a button, you should report it to GUI-button, we do GUI-form and we just pass the button generati…
The buck is passed all of the time, it simply happens internally and out of sight of the customer. In this case, it looks like an open source component managed by a commercial company. They could do everything out of sight, but the open source world also encourages transparency.
That said, maybe a slight change like, "I'll open a ticket with the other team" instead of "you should open a ticket with the other team" makes all the difference. But like I said in another comment, if you open a ticket on github, you aren't paying for that support, you should aim to have a commercial relationship with Microsoft and then raise the issue through that commercial channel.
Otherwise you have no recourse to complain, you are getting everything as-is.