Left channel energy missing when compared to float for stereo @ 13.2 kbps

Basic info

• Float reference:
  • Encoder (float): fbeb5ef8
  • Decoder (float): fbeb5ef8
• Fixed point:
  • Encoder (fixed): 92b81e4c

Bug description

When running the combination float-float and fixed-float and comparing the synthesis at 13.2 kbps, the left channel has systematically a lower energy while the energy of the right channel seems approximately ok.

From top to bottom:

• Left channel original spectrogram
• Left channel float spectrogram
• Left channel fixed-point spectrogram
• Diff between float and fixed-point
• Spectrum plot (red:org; Green: float; White : fixed)

Ways to reproduce

Input in box

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1146

IVAS_cod -STEREO 13200 48 bp02a6s02.wav bit
IVAS_dec_flt STEREO 48 bit out.fxflt.wav

IVAS_cod_flt -STEREO 13200 48 bp02a6s02.wav bit.flt
IVAS_dec_flt STEREO 48 bit.flt out.fltflt.wav