Stereo decoding with JBM: energy difference in right channel despite similar TSM
# Basic info
<!--- Add commit SHA used to reproduce -->
- Encoder (float): d18cbee3417bc331630e6dcf214908deacdc8167
- Decoder: 8f97e97c0121cc13d69a9ac096f88d148f89e39c
# Bug description
In JBM decoding where same TSM between float and fixed-point decdoer seems to be applied, there is a signal section with high MLD. The right channel is attenuated wrt the float reference:
Float ref:

Fixed-point:

Tracefile outputs for both decoders are identical, so same TSM is applied.
# Ways to reproduce
```
./IVAS_dec_fx -voip -Tracefile out/stereo-mixed-music--am1aa1s12--80000.jbm-dly_error_profile_8.dectrace.fx stereo 48 out/stereo-mixed-music--am1aa1s12--80000.netsimout-dly_error_profile_8.192 out/stereo-mixed-music--am1aa1s12--80000.jbm-dly_error_profile_8.dec.fx.wav
./IVAS_dec_flt_ref -voip -Tracefile out/stereo-mixed-music--am1aa1s12--80000.jbm-dly_error_profile_8.dectrace.flt stereo 48 out/stereo-mixed-music--am1aa1s12--80000.netsimout-dly_error_profile_8.192 out/stereo-mixed-music--am1aa1s12--80000.jbm-dly_error_profile_8.dec.flt.wav
```
Bitstream will be shared separately as usual.
<!--- Below are labels that will be added but are not shown in description. This is a template to help fill them.
Add further information to the first row and remove and add labels as necessary. -->
issue