diff --git a/lib_com/options.h b/lib_com/options.h
index 36a2b65aeff7ff85ef0823b4787d1a00f762d371..f57c066bdcdefe19f1af1bc5269877a3cb79e635 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -196,6 +196,7 @@
 #define NONBE_FIX_1208_DFT_STEREO_PLC_BURST             /* Ericsson: Issue 1208, fix for overflow of sample offset counter for burst error in DFT Stereo PLC. */
 #define FIX_1206_ZERO_OUT_IMDCT_BUFFERS_FOR_MCT_IGNORE  /* FhG: zero out all relevant imdct buffers in MCT decoding of channels with mct_chan_mode == MCT_CHAN_MODE_IGNORE */
 #define NONBE_1199_OMASA_JBM_BRATE_SW_FLUSH             /* VA: issue 1199: fix bug in renderer flush in OMASA JBM bitrate switching */
+#define NONBE_1200_ISM_JBM_BRATE_SW_FLUSH               /* VA: issue 1200: fix bug in renderer flush in ISM JBM bitrate switching */
 
 
 /* ##################### End NON-BE switches ########################### */
diff --git a/lib_dec/ivas_ism_dec.c b/lib_dec/ivas_ism_dec.c
index 69ee95e0ac984ead3dbeae2afe5736261a427212..bd0e7075e6577ed1e09ed0e87fb0cff36aca3a86 100644
--- a/lib_dec/ivas_ism_dec.c
+++ b/lib_dec/ivas_ism_dec.c
@@ -133,7 +133,9 @@ static ivas_error ivas_ism_bitrate_switching_dec(
         ivas_output_init( &( st_ivas->hIntSetup ), st_ivas->hDecoderConfig->output_config );
     }
 
+#ifndef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
     {
+#endif
         /* transfer subframe info from DirAC or ParamMC to central tc buffer */
         /* only do this if we are not having done everything already in the TC decoding part and having only played out from the TC buffer */
         if ( last_ism_mode == ISM_MODE_PARAM && st_ivas->hSpatParamRendCom != NULL && st_ivas->hTcBuffer->tc_buffer_mode != TC_BUFFER_MODE_BUFFER )
@@ -154,10 +156,19 @@ static ivas_error ivas_ism_bitrate_switching_dec(
 #ifdef FIX_HRTF_LOAD
             /* flush already done in IVAS_DEC_ReadFormat() */
 #else
-            if ( ( error = ivas_jbm_dec_flush_renderer( st_ivas, tc_granularity_new, renderer_type_old, intern_config_old, &hIntSetupOld, MC_MODE_NONE, last_ism_mode, nSamplesRendered, pcm_resolution, data ) ) != IVAS_ERR_OK )
-            {
-                return error;
-            }
+#ifdef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
+        /* write back info for correct rendering of the flushable samples */
+        int16_t nchan_transport_ref = st_ivas->nchan_transport;
+        st_ivas->nchan_transport = nchan_transport_old;
+
+#endif
+        if ( ( error = ivas_jbm_dec_flush_renderer( st_ivas, tc_granularity_new, renderer_type_old, intern_config_old, &hIntSetupOld, MC_MODE_NONE, last_ism_mode, nSamplesRendered, pcm_resolution, data ) ) != IVAS_ERR_OK )
+        {
+            return error;
+        }
+#ifdef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
+        st_ivas->nchan_transport = nchan_transport_ref;
+#endif
 #endif
         }
         /* JBM: when granularity goes up set samples to discard at the beginning of the frame */
@@ -168,7 +179,9 @@ static ivas_error ivas_ism_bitrate_switching_dec(
                 return error;
             }
         }
+#ifndef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
     }
+#endif
 
     if ( st_ivas->ism_mode != last_ism_mode )
     {
@@ -326,19 +339,26 @@ static ivas_error ivas_ism_bitrate_switching_dec(
      * floating-point output audio buffers
      *-----------------------------------------------------------------*/
 
+#ifndef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
     {
+#endif
         nchan_out_buff = ivas_get_nchan_buffers_dec( st_ivas, -1, -1 );
 
         if ( ( error = ivas_output_buff_dec( st_ivas->p_output_f, nchan_out_buff_old, nchan_out_buff ) ) != IVAS_ERR_OK )
         {
             return error;
         }
+#ifndef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
     }
+#endif
 
     /*-----------------------------------------------------------------*
      * JBM TC buffers
      *-----------------------------------------------------------------*/
+
+#ifndef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
     {
+#endif
         int16_t tc_nchan_full_new;
         DECODER_TC_BUFFER_HANDLE hTcBuffer;
 
@@ -374,7 +394,9 @@ static ivas_error ivas_ism_bitrate_switching_dec(
 
             mvs2s( st_ivas->hTcBuffer->subframe_nbslots, st_ivas->hSpatParamRendCom->subframe_nbslots, MAX_JBM_SUBFRAMES_5MS );
         }
+#ifndef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
     }
+#endif
 
 #ifdef FIX_HRTF_LOAD
     return IVAS_ERR_OK;
@@ -465,6 +487,7 @@ ivas_error ivas_ism_dec_config(
         /* ISM mode switching */
         if ( st_ivas->ism_mode != last_ism_mode )
         {
+
 #ifdef FIX_HRTF_LOAD
             if ( ( error = ivas_ism_bitrate_switching_dec( st_ivas, nchan_transport_old, last_ism_mode ) ) != IVAS_ERR_OK )
 #else
diff --git a/lib_dec/lib_dec.c b/lib_dec/lib_dec.c
index 3b42e56a128515488703f0effbe7ac7e2ecde6e6..66d70060c8cfb23f869b82698a47125b697aaf1e 100644
--- a/lib_dec/lib_dec.c
+++ b/lib_dec/lib_dec.c
@@ -1043,9 +1043,11 @@ ivas_error IVAS_DEC_ReadFormat(
             /* JBM: when granularity goes down (e.g. Discrete ISM with TD Obj Renderer -> ParamISM with binaural fastconv
             render what still fits in the new granularity */
             int16_t tc_granularity_new = ivas_jbm_dec_get_render_granularity( st_ivas->renderer_type, st_ivas->ivas_format, st_ivas->mc_mode, st_ivas->hDecoderConfig->output_Fs );
-
+#ifdef NONBE_1200_ISM_JBM_BRATE_SW_FLUSH
+            st_ivas->nchan_transport = nchan_transport_old;
+#else
             // st_ivas->nchan_transport = nchan_transport_old; // ToDo: temporarily deactivated to keep FIX_HRTF_LOAD bit-exact but this is likely a bug in the main -> see issue #1200
-
+#endif
 #ifndef NONBE_1199_OMASA_JBM_BRATE_SW_FLUSH
             if ( st_ivas->ivas_format == MASA_FORMAT )
             {