Basop Encoder Artifact for Stereo 13.2 kps DTX Background Noise Segment
# Basic info
<!--- Add commit SHA used to reproduce -->
- Float reference:
- Encoder (float):ceb8871f
- Decoder (float):ceb8871f
- Fixed point:
- Encoder (fixed):c89d638e
- Decoder (fixed):
# Bug description
Strong artifacts are observed at the end of an background noise stereo input at 13.2 kbps, DTX.
Float:

Basop:

# Ways to reproduce
Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1428
<!-- Commandline or script -->
```bash
./IVAS_cod_ref.exe -stereo 13200 32 lobin.wav bitref
./IVAS_dec_ref.exe stereo 32 bitref refout.wav
./IVAS_cod.exe -stereo 13200 32 lobin.wav bit
./IVAS_dec_ref.exe stereo 32 bit dutout.wav
```
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issue