Major MLD regression for encoding HOA1, -16LKFS, 16kHz signals at 13.2kbps

Basic info

Bug description

input	fbeb5ef8 vs ad936ef6	00ba8bcd vs 24f29d12
am5ba1s11_HOA1_16_-16.wav	24.7	45.7
bm4ba1s11_HOA1_16_-16.wav	24.7	45.7
dm4aa1s11_HOA1_16_-16.wav	24.7	45.7
dm5aa1s11_HOA1_16_-16.wav	24.7	45.7

One common symptom observed with the new codes is a 10 dB difference at the top of the spectra at some frames. Some 5-10dB differences were observed at other frequencies.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1181

Command lines: plese see cmds.txt in the above Box folder. One example is

${BINPATH}/IVAS_cod -no_delay_cmp -sba 1 13200 16 ${TVPATH}/am5ba1s11_HOA1_16_-16.wav ${OUTPATH}/am5ba1s11_HOA1_16_-16_13200_CTX_dut.g192 ${BINPATH}/IVAS_dec_ref -no_delay_cmp FOA 16 ${OUTPATH}/am5ba1s11_HOA1_16_-16_13200_CTX_dut.g192 ${OUTPATH}/am5ba1s11_HOA1_16_-16_13200_CTX_dut_FOA_ref.wav ${BINPATH}/IVAS_cod_ref -no_delay_cmp -sba 1 13200 16 ${TVPATH}/am5ba1s11_HOA1_16_-16.wav ${OUTPATH}/am5ba1s11_HOA1_16_-16_13200_CTX_ref.g192 ${BINPATH}/IVAS_dec_ref -no_delay_cmp FOA 16 ${OUTPATH}/am5ba1s11_HOA1_16_-16_13200_CTX_ref.g192 ${OUTPATH}/am5ba1s11_HOA1_16_-16_13200_CTX_ref_FOA_ref.wav