Significant spectral distortion between 8 to 15kHz for SBA 32kbps

floating point ref sha: d9fdb374 fixed point sha: 912d574f

Significant spectral distortion is observed in the fixed point output as compared to the floating point one between 3.75s and 4.2s, as depicted in the attached plot.

Input bitstream: ap05a2s04_HOA1S_-26_32000_CTX.g192

Decoder/Renderer command line: ./IVAS_dec -no_delay_cmp FOA 48 ap05a2s04_HOA1S_-26_32000_CTX.g192 dec.wav ./IvAS_rend_ref -i dec.wav -if FOA -o out.wav -of BINAURAL