'Unable to dump stack trace: InvalidBlockIndex' on Win 10, Zig 0.15.1/2

A few weeks ago I got stack traces, I took a break and came back and no stack traces. I have no idea what happened. I’ve been working on this project for 13 months, and always had stack traces. I upgraded to 0.15.1 in Nov/Dec it was working until later Jan, I came back to the project yesterday and no more stack traces:

thread 21540 panic: attempt to use null value
Unable to dump stack trace: InvalidBlockIndex

I have no idea how to continue my project without this, and I have no idea what caused it to stop. I know Win 10 keeps updating even though they say it’s EOL, and I saw my terminal change colors, did they break it? How do I get it back? I can’t continue my project without stack traces.