If you configure a custom device in flutter master channel, flutter doctor -v will list the device but not flutter devices or flutter run.

Steps to Reproduce

1. flutter upgrade master
2. flutter config --enable-custom-devices
3. flutter custom-device add add any custom device (commands don't matter, you can use true for each)
4. flutter doctor -v will list the device
5. flutter devices will not

I have this fixed already, just need an issue to link the PR to.