Google Classroom Share button not working suddenly

Question

We integrated the Google Classroom Share button per these docs - https://developers.google.com/classroom/guides/sharebutton - back in Apr. Today we noticed it was not working, and saw these errors in the JavaScript console. Googling for "homeroom_share_widget" turns up very little, though there is a page with a copy of another StackOverflow post where someone reported this on Aug 4th 2020 and it "resolved itself."

www.gstatic.com/classroom/sharewidget/widget_stable.html?usegapi=...com&pfname=&rpctoken=71244563:1 
Refused to apply style from 

https://www.gstatic.com/_/hr/_/ss/k=homeroom.homeroom_share_widget.-6njcba4tmj9p.L.X.O/d=1/ct=zgms/rs=AK3ymSVKf9-q6qT49CxfhvwE4dkes0zTHw/m=share_widget

because its MIME type ('text/html') is not a supported 
stylesheet MIME type, and strict MIME checking is enabled.

Answer 1

Google identified the problem on their side and fixed it. See https://issuetracker.google.com/u/1/issues/162785095 for details.