### Basic info - Commit SHA: 2c21b46ce37a57f3437780f348596fc252bb5a37 - Platform: all ### Bug description The IGF decoder in the copy up of source regions replaces lines generated by the TCX core coder noisefilling with newly generated random noise. In the IGF stereo encoder this replacement is done on the wrong source spectra in case of frames with no whitening singalled for IGF. ### Ways to reproduce (Clear steps or refer to a failing automated test, e.g. with a pipeline link) <!--- 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. -->