bids-validator
                                
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                        PET / MRI entanglement broken, spooky action at a distance not observed
BIDS states that NonlinearGradientCorrection is "RECOMMENDED, but REQUIRED if PET data are present".
This is not implemented in the legacy validator:
https://github.com/search?q=repo%3Abids-standard%2Fbids-validator+NonlinearGradientCorrection&type=code
Nor, in fact, is it actually followed in examples:
https://github.com/search?q=repo%3Abids-standard%2Fbids-examples+NonlinearGradientCorrection&type=code
There is a mis-capitalized version of it in one example.
xref https://github.com/bids-standard/bids-validator/pull/1229
cc @bendhouseart