In FD CNG decoder handle, the following buffers are defined: ``` hFdCngDec->hFdCngCom->olapBufferSynth[] hFdCngDec->hFdCngCom->olapBufferSynth_fx[] ``` The first one is Word16 and comes from the EVS, while the other one is Word32 and is intorduced in IVAS. The issue is that the later buffer is never updated and used only at one switching place. I read the logic such that * it is used wrongly in `core_switching_pre_dec_ivas_fx()` * contains always only zeros from the initialization * \-\> should be replaced by the first buffer <!--Commandline or script--> ```bash ``` <!--- 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.-->