When I was in my formative years as a folk-singer (Ha) our local Library had a set of LPs entitled, I think, 'Folk Song in Britain.'
These were recordings taken 'in the field' and most of the singers sounded like oldsters, in some cases 'with drink taken' as they say in Ireland. I think.
It changed my mind about trying to sing the 'definitive' versions. None of the singers sounded trained, all had regional accents and dialects. Anyone who has 'folk-police' instincts should try to hear them.

I just try to sing something that makes sense, nowadays, but I avoid some great songs that have appalling grammar.
If I sing at all.