Decoder crash for Stereo at 96kbps FER in IGF_appl_ivas()
The fixed point decoder crashes with an assert in `basop32.c:1786`:
```
Frames processed: 2303 Assertion failed: (0), function L_add, file basop32.c, line 1786.
```


Steps to reproduce:
```bash
./IVAS_cod_flt_ref -stereo -max_band FB 96000 48 experiments/basop-verification/stereo-noisy_speech-p800-2/proc_input_d/cat1/20ms_aligned_files_concatenated.wav out/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000.192
eid-xor -vbr -fer out/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000.192 error_patterns/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000_ep.192 out/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000.fer.192
./IVAS_dec_fx stereo 48 out/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000.fer.192 out/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000.fer.dec.fx.wav
```
Float reference SHA (`_flt_ref`): d9fdb37455cc5b9a41cc3c1229561a8731f475d0
FX binary SHA (`_fx`): 2470528bfb069d979283a8be56fc588f38040110
Error pattern file: [stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000_ep.192](/uploads/e72e0337bf66afd50770d290c52d4bd8/stereo-noisy_speech-p800-2-cat1-lab_d--20ms_aligned_files_concatenated--96000_ep.192)
Bitstream can be shared upon request.
issue