The schema is considered invalid by **some** versions of
configvalidator (or rather, the underlying jsonschema):
```
128: '#definitions/groups' does not match '^[^#]*#?$'
128:
128: Failed validating 'pattern' in metaschema['properties']['definitions']['additionalProperties']['$dynamicRef']['allOf'][0]['properties']['$id']:
128: {'$comment': 'Non-empty fragments not allowed.',
128: '$ref': '#/$defs/uriReferenceString',
128: 'pattern': '^[^#]*#?$'}
```
Remove the `#` from the IDs.
bb05deca33