[crash][regresssion] NONBE_FIX_MC_LFE_LPF causes LTV testcase crash; blocks further merging to main

Basic info

• Encoder and Decoder (float): N/A
• Decoder (fixed): 97d71705

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.

// 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