Index bug in RNN-T beam search algorithm ALSD
Please refer to https://github.com/espnet/espnet/issues/3781 for details.

Codes locate at
https://github.com/NVIDIA/NeMo/blob/807b001f2e20ac6ab2930419c32076d242128c5d/nemo/collections/asr/parts/submodules/rnnt_beam_decoding.py#L785-L787