Frequency overshoot in MDCT-stereo @48kbps WB

Basic info

• Float reference:
  • Decoder (float):05f58f72
• Fixed point:
  • Encoder (fixed):12778592

Bug description

For this particular issue, beside the observed quality issues that are observed at this bitrate (see #1078 (closed)) there is a frequency overshoot at frame 120 as can be seen at the spectrogram below:

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1190

./IVAS_cod -stereo -max_band WB 48000 16 dp03a1s01_16.wav bit.192
./IVAS_dec_flt_ref stereo 16 bit.192 out.wav