fix: don't complain about system prop and env config keys

[Macroz]

Fixes #2935.

The keys are automatically passed in, so we shouldn't complain about them.

Checklist for author

Remove items that aren't applicable, check items that are done.

Reviewability

• Link to issue

Backwards compatibility

• Config is backwards compatible

Documentation

• Update changelog if necessary

Testing

• Complex logic is unit tested (not sure if it's worthwhile)