The problem is that the original poem
A Christmas Carol
has A) unusual words, construction and omission making it grammatically difficult to understand, and B) irregular word stress that no melody can fit every syllable of every verse into the same rhythm. Google Holst's In the Bleak Midwinter to see how different editors solve these in different ways, but Holst himself provided the to Ralph Van Williams for The English Hymnal in 1906:
We'll decide soon what verses and rhythms the Rose City Timberliners Chorus will sing in December 2025.
Refs:
https://www.poetryfoundation.org/poems/53216/in-the-bleak-midwinter