Decoder crash for ParamMC 5.1 at 48/64/80 kbps decoding to mono in ivas_ls_setup_conversion_fx()

Basic info

• Float reference:
  • Encoder (float): 31b60873
  • Decoder (float):
• Fixed point:
  • Encoder (fixed):
  • Decoder (fixed): 339e804c

Bug description

The fixed point decoder crashes with an assert:

Assertion failed: (0), function L_add, file basop32.c, line 1661.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1408

./IVAS_cod_flt_ref -mc 5_1 -max_band FB 48000 48 am2aa1s06_48.10dB.wav bit
./IVAS_dec_fx mono 48 bit out.wav