diff --git a/lib_com/options.h b/lib_com/options.h
index 83a32c2eaba6b44b946f23717b631106d54f8e74..4b8f2828b70cf967f4ea851203c4149f398fb58d 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -176,6 +176,7 @@
 #define NONBE_1122_KEEP_EVS_MODE_UNCHANGED              /* FhG: Disables fix for issue 1122 in EVS mode to keep BE tests green. This switch should be removed once the 1122 fix is added to EVS via a CR.  */
 #define NONBE_1328_FIX_NON_LINEARITY                    /* VA: Fix possible issue when computing bwe_exc_extended and previous frame were almost 0  */
 #define NONBE_1321_JBM_ASSERT_BITRATE_SWITCHING         /* FhG: Fix assert being hit in JBM code during rate switching */
+#define NONBE_FIX_1376_MDCT_CONCEALMENT                 /* FhG: fix concealment artifact in MDCT Stereo with DTX, in case transition frame gets lost */
 
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_dec/ivas_mdct_core_dec.c b/lib_dec/ivas_mdct_core_dec.c
index 7ba536809ca7f5f5988fcb7bb17e4e2be0d280d6..426be4d02d602a22681f0b102cff880bd55d7bc4 100644
--- a/lib_dec/ivas_mdct_core_dec.c
+++ b/lib_dec/ivas_mdct_core_dec.c
@@ -1104,7 +1104,17 @@ void ivas_mdct_core_tns_ns(
             decoder_tcx_tns( st, L_frame_global[ch], L_spec[ch], L_frame[ch], L_frameTCX[ch], &x[ch][k][0], fUseTns[ch][k], &tnsData[ch][k], bfi, k, 1 );
 
             sns_shape_spectrum( x[ch][k], st->hTcxCfg->psychParamsCurrent, &sns_int_scf[0], st->hTcxCfg->psychParamsCurrent->nBins );
+#ifdef NONBE_FIX_1376_MDCT_CONCEALMENT
+            /*
+               2025-09-07, mul:
+               in case of PLC, applying SNS up to L_spec might not be enough: In case the transition frame from DTX after an inactive period is lost, L_spec is assumed to represent a regular TCX frame,
+               however, this frame is nevertheless acting as an transition frame as also visible in L_frameTCX; thus, the safer approach to prevent high frequency artifacts is to apply the SNS up to L_frameTCX;
+               in case this is not necessary, x[] is filled with zeros, and the multiplication is not causing any additional harm
+            */
+            v_multc( x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, sns_int_scf[FDNS_NPTS - 1], x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, max( L_spec[ch], L_frameTCX[ch] ) - st->hTcxCfg->psychParamsCurrent->nBins );
+#else
             v_multc( x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, sns_int_scf[FDNS_NPTS - 1], x[ch][k] + st->hTcxCfg->psychParamsCurrent->nBins, L_spec[ch] - st->hTcxCfg->psychParamsCurrent->nBins );
+#endif
 
             decoder_tcx_tns( st, L_frame_global[ch], L_spec[ch], L_frame[ch], L_frameTCX[ch], &x[ch][k][0], fUseTns[ch][k], &tnsData[ch][k], bfi, k, 0 );
         }