fix: resolve the source of errors for top-level references #828
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It's a cherry-pick of the fix originally provided in 05e909d. Since it's unrelated, let's merge it ASAP, while I'm addressing the comments regarding the actual part of that PR. Will also reduce the noise in that PR making it easier to review.
Checklist
Does this PR introduce a breaking change?
Additional context
Minor fix for top-level $refs. Right now, the source of error would not always be detected correctly for such a document
Rather unlikely to be an often case, but it's still good detect it correctly.