diff --git a/lib_com/options.h b/lib_com/options.h
index 4e4d157cae9f07a81b221a55558109581619eff6..4dda4cf2aaa6bf75455b85297e0189cade079261 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -145,6 +145,7 @@
 #define NONBE_FIX_1337_MISSING_DIRECTIVITY_DISTATT_EXTREND /* Eri: issue 1337: Missing directivity setting and distance attenuation in external renderer IVAS_rend */
 #define NONBE_1214_PLC_LSF_MEMORY                       /* VA: issue 1224: reset ACELP PLC FEC memory in case of switching from MDCT stereo to TD/DFT stereo */
 #define NONBE_1293_SR_HRTF                              /* VA: issue 1293: add support of external HRTFs in split rendering */
+#define NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH             /* VA: issue 1220: fix bug in renderer flush in OMASA 1ISM JBM bitrate switching */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_jbm_dec_fx.c b/lib_dec/ivas_jbm_dec_fx.c
index 49cedb561715ea74a2b752c7138cca5b94d46248..6fe8fd9b0b55621b9113d9e59437f68dfa5c28b2 100644
--- a/lib_dec/ivas_jbm_dec_fx.c
+++ b/lib_dec/ivas_jbm_dec_fx.c
@@ -2688,7 +2688,7 @@ ivas_error ivas_jbm_dec_render_fx(
 }
 
 /*--------------------------------------------------------------------------*
- * ivas_jbm_dec_dec_flush_renderer()
+ * ivas_jbm_dec_flush_renderer()
  *
  * Flush samples if renderer granularity changes on a bitrate change
  *--------------------------------------------------------------------------*/
@@ -2887,7 +2887,11 @@ ivas_error ivas_jbm_dec_flush_renderer_fx(
         {
             IF( EQ_16( ism_mode_old, ISM_MASA_MODE_DISC ) )
             {
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+                Word32 *tc_local_fx[MAX_NUM_OBJECTS];
+#else
                 Word32 *tc_local_fx[MAX_TRANSPORT_CHANNELS];
+#endif
 
                 move16();
                 FOR( ch_idx = 0; ch_idx < st_ivas->nchan_ism; ch_idx++ )
@@ -2896,6 +2900,12 @@ ivas_error ivas_jbm_dec_flush_renderer_fx(
                     Copy32( st_ivas->hMasaIsmData->delayBuffer_fx[ch_idx], tc_local_fx[ch_idx], st_ivas->hMasaIsmData->delayBuffer_size ); /*Q11*/
                 }
 
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+                IF( NE_32( ( error = ivas_td_binaural_renderer_sf_fx( st_ivas, p_output_fx, hTcBuffer->n_samples_granularity ) ), IVAS_ERR_OK ) )
+                {
+                    return error;
+                }
+#else
                 IF( st_ivas->nchan_ism > 0 )
                 {
                     IF( NE_32( ( error = ivas_td_binaural_renderer_sf_fx( st_ivas, p_output_fx, hTcBuffer->n_samples_granularity ) ), IVAS_ERR_OK ) )
@@ -2914,6 +2924,7 @@ ivas_error ivas_jbm_dec_flush_renderer_fx(
                     move16();
                     move16();
                 }
+#endif
             }
         }
         ELSE IF( EQ_16( st_ivas->ivas_format, SBA_ISM_FORMAT ) )
diff --git a/lib_dec/ivas_objectRenderer_internal_fx.c b/lib_dec/ivas_objectRenderer_internal_fx.c
index bc8b110bb5a03162fb89563a591f5c766d673c51..786523366d270811ba002d00e1915d1908016cfc 100644
--- a/lib_dec/ivas_objectRenderer_internal_fx.c
+++ b/lib_dec/ivas_objectRenderer_internal_fx.c
@@ -100,7 +100,13 @@ ivas_error ivas_td_binaural_renderer_sf_fx(
     Word16 enableCombinedOrientation;
 
     /* Set the number of ISMs */
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    test();
+    test();
+    IF( EQ_32( st_ivas->ivas_format, MASA_ISM_FORMAT ) || ( EQ_32( st_ivas->ivas_format, MASA_FORMAT ) && GT_16( st_ivas->nchan_ism, 0 ) ) )
+#else
     IF( EQ_32( st_ivas->ivas_format, MASA_ISM_FORMAT ) )
+#endif
     {
         nchan_ism_internal = st_ivas->nchan_ism;
         move16();
diff --git a/lib_dec/ivas_omasa_dec_fx.c b/lib_dec/ivas_omasa_dec_fx.c
index a85a2a2596726ff6299d4f305f82afc05769b3d4..1982188997e4875527cee6b9ddd7d53cf4771077 100644
--- a/lib_dec/ivas_omasa_dec_fx.c
+++ b/lib_dec/ivas_omasa_dec_fx.c
@@ -1233,17 +1233,24 @@ ivas_error ivas_omasa_dirac_td_binaural_jbm_fx(
 )
 {
     Word16 n;
-    move16();
     ivas_error error;
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    Word32 *p_sepobj_fx[BINAURAL_CHANNELS]; // Q11
+    Word32 data_separated_objects_fx[BINAURAL_CHANNELS][L_FRAME48k];
+#else
     Word32 *p_sepobj_fx[MAX_NUM_OBJECTS]; // Q11
     Word32 data_separated_objects_fx[MAX_NUM_OBJECTS][L_FRAME48k];
-    move16();
+#endif
     Word16 slot_idx_start;
 
     slot_idx_start = st_ivas->hSpatParamRendCom->slots_rendered;
     move16();
 
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    FOR( n = 0; n < BINAURAL_CHANNELS; n++ )
+#else
     FOR( n = 0; n < MAX_NUM_OBJECTS; n++ )
+#endif
     {
         p_sepobj_fx[n] = &data_separated_objects_fx[n][0];
     }
@@ -1281,6 +1288,7 @@ ivas_error ivas_omasa_dirac_td_binaural_jbm_fx(
         {
             return error;
         }
+
         st_ivas->nchan_transport = nchan_transport_orig;
         move16();
         cldfb_slots = *nSamplesRendered / num_cldfb_bands;
@@ -1321,6 +1329,7 @@ ivas_error ivas_omasa_dirac_td_binaural_jbm_fx(
     return IVAS_ERR_OK;
 }
 
+
 /*--------------------------------------------------------------------------*
  * ivas_omasa_rearrange_channels()
  *