### Basic info - Commit SHA: 3d656b6 - Platform: Linux ### Bug description Clang msan error when the last frame of a DFT-Stereo mode is lost and is concealed with TCX FD concealment and the next good frame is in a bitrate with MDT-Stereo. See https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/jobs/34979. Solution is to synch `st->hTcxDec->L_frameTcx` for both channels after allocating a second core coder since it is uninitialized int these scenarios, but needed in ivas_core_dec.c:283++. <!--- 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. -->