I know 25 years ago when I kept snakes, I would feed all sorts, red wigglers were the easiest to find so they often got those, along with gold fish and frozen whitebait!
I did have a Thiamine problem (snake had a fit, hurling itself round the tank) but after a trip to the vet, a couple of injections later and a regular dusting of powder feeding carried on the same , snake made a full recovery and no more problems....
....
However, never with ones so small!, one is a real fussy eater, and the worms seem to work, ...
I am hoping that the problems occur with excessive build up, and that a one of is not good but won't be too much..
will go digging in the morning and see if I can find any real ones in the snow!