As exasperating as it was at the time, I’m glad you spotted that mis-twisted cable before I entered my gansey in the MN State Fair. Not that I expect a ribbon, but if that were the reason I don’t get one, what an avoidable disappointment.
Threading the ends to the wrong side, I then set about making as invisible a repair as I could. With yarn of this weight, splitting into plies and weaving ends in separately in as many directions as possible helps a lot with invisibility.
Shaving the ends off rather than a sharp snip and then a little massaging with the fingers results in the ends nearly melting into the background. See the difference in the close up - the top yarn was snipped and the bottom yarn was kind of feathered with the scissors in a shaving motion. Which do you think will be most noticeable?