What is the issue with the HTML Standard?

After #10404, we have a new replacement for "report the exception", the very-similarly-named "report an exception". However, its behavior an arguments are quite different.

We need to look at all the callers and update them to use the new version.

However, it is probably best to do this after whatwg/webidl#1423, because that change will remove many of the current callers.