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Energy gap in BWE region for MDCT-stereo @48kbps

I have discovered an issue from the BASOP code verification that is there in the float code but not in BASOP. There is a sudden energy gap for item dp03a1s06 of the mixed-music set in the BWE frequency range at time stamp 0:02.719 that lasts for 2 and a half frames:

Float

Screenshot_2025-01-17_at_11.55.10

Original

Screenshot_2025-01-17_at_11.55.20

BASOP

Screenshot_2025-01-17_at_12.12.10

to reproduce

./IVAS_cod -stereo -max_band FB 48000 48 dp03a1s06_48.wav dp03a1s06.192
./IVAS_dec stereo 48 dp03a1s06.192 dp03a1s06.dec.wav
Edited by fotopoulou