google cloud debugger snapshot reports "No code found at line...", python on managed cloud run

Question

I have a github repo which triggers cloud run build, deployed via console to cloud run. In the debugger setup, I created a GC source repository mirror. The setup seems to be good. Pushed changes appear in the debugger console. I am using a flask server as is canonical in python for cloud run. The debugee registers, placed after app creation and before routing to my endpoint. I can see snapshots. I love it. Usually.

There comes a point in my code at which the debugger will let me know No code found at line 75 in /app/app.py. Try lines 69 or 324. It's a little interesting that the file has just 87 lines.

Any theories?