Wrong BWE energy in MDCT stereo 48 & 64 kbps

With 30632c9d,

when decoding at 48kbps, or 64 kbps, the BWE has a wrong energy level. As shown on the spectrogram (top is float, middle is Fix-point), where there should be energy there is almost nothing, while there is energy where it should not

On bitstream example : bit

Command line : IVAS_dec STEREO 32 bit syn