Warner Archive may not release titles that are always to my taste, but the one thing they always do is release every title in the best possible quality, inclusive of not releasing titles where the master isn’t good enough.
If they have issued a ‘toon with dnr, there will be a very good reason...
I imagine they’re stored in that amazing vault containing London after Midnight, the Welles version of Magnificent Ambersons and the Zapruder film where Han shot first...