Strong artifact in transition between modes

(Generic issue template) An artifact is observed during a mode switch for stereo DTX input at 24.4kbps. The issue is not present in BASOP which resulted in high MLD during verification process. The artifact is present in ivas-float-update branch.

Float code output can be seen here with an arrow pointing the artifact:

BASOP output:

The input file is available upon request.

To reproduce:

./IVAS_cod.exe -dtx -stereo 24400 48 clip.wav bit
./IVAS_dec.exe stereo 48 bit out.wav