SPI woes

if I power cycle the part after making it with with fs, it continues to work

Not sure I understand what you're saying?

I think I know what the issue is. Try changing scl: to sck: :)

It doesn't error because it's perfectly valid to not want sck to be brought out on a pin. If you don't mention it, it won't be set up.

Strange that reset() doesn't stop it working though. The pin states are all set back to defaults so I'm not sure I get why it would then keep going.