BASOP decoder does not finish when decoding OMASA bitstream from ltv testvector set with lowered level

Recent long testvector pipelines with 10dB attenuation timed out. This is due to a testcase not ending (decoder enters an endless loop somewhere), see e.g.: https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/jobs/212307.

How to reproduce:

Build ref and fxp codec:

git checkout 20231128_Update_Ittiam
make -j
mv ./IVAS_cod IVAS_cod_ref
mv ./IVAS_dec IVAS_dec_ref
git checkout main
make -j

Get ltv testvectors:

git clone https://forge.3gpp.org/rep/ivas-codec-pc/ivas-pc-testfiles.git
cd ivas-pc-testfiles
git checkout longer-testv-on-runners
cd -

Get scaling script from float repo and scale testvectors (10 dB attenuation):

git clone https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec.git
cd ivas-codec
git checkout basop-ci-branch
python3 tests/scale_pcm.py ../ivas-pc-testfiles 0.3162

Run ref encoder:

./IVAS_cod_ref -ism_masa 4 2 ivas-pc-testfiles/ltv48_OMASA_4ISM_2TC_ISM1.csv NULL NULL ivas-pc-testfiles/ltv48_OMASA_4ISM_2TC_ISM4.csv ivas-pc-testfiles/ltv48_OMASA_4ISM_2TC.met 64000 48 ivas-pc-testfiles/ltv48_OMASA_4ISM_2TC.wav bit

Run fxp decoder - will not finish, but enter endless loop or similar:

./IVAS_dec HOA2 48 bit out.wav

Running the ref decoder for comparison works.