Biome's "extends" configuration clause appears to not work for already-extended configuration files.

Run the following:

cd ./examples/doubly-nested && yarn run biome check example.json

And observe that it is unable to parse the file:

Expected a property but instead found '// Recommendations'
…

Observe that biome is able to correctly parse the example file in this scenario:

cd ./examples/singly-nested && yarn run biome check example.json

Observe that biome is able to correctly parse the example file in this scenario:

cd ./examples/no-nesting && yarn run biome check example.json