Whitespace before label in MultipleChoiceTask causes wrong label probability prediction

[RibinMTC]

Hi,

When constructing the requests for a MultipleChoiceTask (pre-refactored version), an implicit white space is added before the labels:

def construct_requests(self, doc, ctx):
      lls = [
          rf.loglikelihood(ctx, " {}".format(choice))[0] for choice in doc["choices"]
      ]

      return lls

When using fine-tuned models for evaluation, which expect a specific format, the added white space causes the wrong prediction of label probabilities. How should I handle this for my custom fine-tuned llms?