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Mid frequency range spectral gaps in MDCT-stereo @96 kbps

For the stv stvST48c.wav there are spectral gaps observed (probably due to noise filling issue) approx. for the frequency range 10kHz-12.8kHz.

This is the original input:

Screenshot_2025-01-13_at_12.35.55

this is the the version coded and decoded with float:

Screenshot_2025-01-13_at_12.34.42

and this is the version encoded with BASOP and decoded with float:

Screenshot_2025-01-13_at_12.40.20

to reproduce: IVAS_cod -stereo 96000 48 stvST48c.wav bit IVAS_dec stereo 48 bit out.wav

BASOP SHA:aab60543 Float SHA: 10a1ab85