[crash][regresssion] NONBE_FIX_MC_LFE_LPF causes LTV testcase crash; blocks further merging to main
# Basic info
<!--- Add commit SHA used to reproduce -->
- Encoder and Decoder (float): N/A
- Decoder (fixed): 97d71705f6d609fb7b5e15a72be28110a6f1f3ed
# Bug description
The following testcase fails with an assert in the BASOP decoder:
```
Frames processed: 767 Assertion failed: (0), function L_shl, file basop32.c, line 2340.
```
```sh
// Multi-channel 5_1 bitrate switching from 24.4 kbps to 256 kbps, 48kHz in, 48kHz out, BINAURAL out, FER at 10%, bandwidth switching
../IVAS_cod -max_band testv/ivas_bws_20fr_start_WB.txt -mc 5_1 ../scripts/switchPaths/sw_24k4_256k.bin 48 testv/ltv48_MC51.wav bit
eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_10pct.g192 bit_error
../IVAS_dec BINAURAL 48 bit_error testv/ltv48_MC51.wav_sw_48-48_binaural_FER10.tst
```
See also artifacts of this job:
https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/jobs/511540
# Ways to reproduce
See above
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issue