code: def _create_alt_equals_ref_noncds(self):
          
          alt_data = AltTranscriptData(
              list(self._transcript_data.transcript_sequence),
              self._transcript_data.cds_start,
              self._transcript_data.cds_stop,
              False,
              None,
              self._transcript_data.protein_accession,
              is_ambiguous=True)
          return alt_data
docs: Create an alt seq that matches the reference (for non-cds variants)