Wrong lpc coefficient for TD-BWE @ 1.75 kbps (during TD stereo)

With 82ff6a30 and the following bitstream : 800_ff_mic12_SbSb003_-stereo_24400_32.bit

command line used was IVAS_dec STEREO 48 bit syn

We can observe TD-BWE wrong shape in case of TD stereo. In the first figure, we can see the right channel of the floating point synthesis followed by right channel of the fixed point synthesis (same problem can be observed on the left channel) and the frequency representation of both signals.

The second figure shows the lpc coefficient printed out for float and fix and the different between both.

The next 2 figures are the same as above, but showing the effect of a proposed solution.