This isn’t much of an answer but I was running into the same issue with WebStorm and then similarly on VSCode. In VSCode, I removed ALL my breakpoints everywhere in the debugger session, restarted the debug session, and then it loaded just fine. After this I was then able to add breakpoints that were hit after the initial load.
I believe this has something to do with a new Chrome update.
Here’s a link the issue that JetBrains has been addressing that might help explain the problem a little more, though will help you little in ultimately fixing it.