Encoder crash for Stereo at 48/64kbps DTX on/off in kernel_switch_trafo_fx()

Basic info

• Float reference:
  • Encoder (float):
  • Decoder (float):
• Fixed point:
  • Encoder (fixed): 909f10c3
  • Decoder (fixed):

Bug description

The fixed point encoder crashes with an assert:

Frames processed:       1535    Assertion failed: (0), function L_add, file basop32.c, line 1784.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1157

./IVAS_cod_fx -stereo -max_band FB 48000 48 stereo-noisy_speech-p800-2-cat4-lab_b-20ms_aligned_files_concatenated_48.10dB.wav bit
./IVAS_cod_fx -stereo -max_band FB 64000 48 stereo-noisy_speech-p800-2-cat4-lab_b-20ms_aligned_files_concatenated_48.10dB.wav bit

./IVAS_cod_fx -dtx -stereo -max_band FB 48000 48 stereo-noisy_speech-p800-2-cat4-lab_b-20ms_aligned_files_concatenated_48.10dB.wav bit
./IVAS_cod_fx -dtx -stereo -max_band FB 64000 48 stereo-noisy_speech-p800-2-cat4-lab_b-20ms_aligned_files_concatenated_48.10dB.wav bit