I have had a similar experience... perfect debugging, breakpoints working, everything fine, up until yesterday. I think something in my stack got upgraded, and ever since, exceptions have broken callstacks. Trying to click a breakpoint takes me somewhere completely else in the sources viewer, and sometimes, exceptions don't break at all. No, I don't know why. Something broke, I still need to investigate, but it's another annoyance that reminds me of how much of my time is going to debugging and fixing platform issues.

I think the big issue is just how fragile and brittle source maps are. They feel like a joke, compared to DWARF and native debuginfo.

But who knows, maybe they'll start working again tomorrow.