VScode Debugger fails to launch with custom board

[Jason]

I think this is a bug report for the VScode plugin 

One of my boards shows this error when I try to debug

• Nrf52833 custom board connected with SWD on Jlink
• I was able to debug this board before.
• I can still debug other boards.
• I can debug this board with Segger embedded studio.
• I can program it and I can attach RTT viewer

I suspect there's some stray/locked/missing files somewhere that are specific to this MCU but I have no idea where to look.

What command is used to launch the debugger? is there any way to get a log that might include the error?

[Jason]

I forgot to mention that I've already tried "Erase board" and "recover board" from the VScode extension

(and I should also mention that the VScode extensions are simply fantastic and I would have absolutely hated trying to develop without them.)