diff --git a/lib_com/options.h b/lib_com/options.h
index 0d18daf5eadfe2c245b0a341db9d003b75912352..0174d5aa9c246751ec501b7ef6b0e0d2ddc04181 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -183,6 +183,7 @@
 
 
 #define NONBE_1200_ISM_JBM_BRATE_SW_FLUSH               /* VA: issue 1200: fix bug in renderer flush in ISM JBM bitrate switching */
+#define NONBE_FIX_1205_TD_STEREO_MOD_CT                 /* VA: fix mismatch of coder_type (mod_ct) btw. TD stereo encoder and decoder */
 
 
 /* ##################### End NON-BE switches ########################### */
diff --git a/lib_dec/ivas_stereo_td_dec.c b/lib_dec/ivas_stereo_td_dec.c
index 9ed0fb2e1b1d4c4c0cbe107f0c3d526ee46f4136..5c534e08f185d873199c76128ae6e1f6c66fb165 100644
--- a/lib_dec/ivas_stereo_td_dec.c
+++ b/lib_dec/ivas_stereo_td_dec.c
@@ -251,7 +251,6 @@ void tdm_configure_dec(
     }
 
 #ifdef DEBUG_MODE_TD
-    dbgwrite( &mod_ct, 2, 1, 320, "res/mod_ct.dec" );
     dbgwrite( tdm_ratio_idx, 2, 1, 320, "res/tdm_ratio_idx.dec" );
     dbgwrite( &tdm_inst_ratio_idx, 2, 1, 320, "res/tdm_inst_ratio_idx.dec" );
     dbgwrite( &hStereoTD->tdm_lp_reuse_flag, 2, 1, 320, "res/tdm_lp_reuse_flag.dec" );
diff --git a/lib_enc/ivas_decision_matrix_enc.c b/lib_enc/ivas_decision_matrix_enc.c
index dec6a9bc59cbe53f20be43d23e5138ea4e54accc..c5c58fbeba72f9506d42e6f481ef937dd5fbf19a 100644
--- a/lib_enc/ivas_decision_matrix_enc.c
+++ b/lib_enc/ivas_decision_matrix_enc.c
@@ -215,7 +215,18 @@ void ivas_decision_matrix_enc(
     if ( st->core == TCX_20_CORE && st->total_brate < STEREO_TCX_MIN_RATE )
     {
         st->core = ACELP_CORE;
+
+#ifdef NONBE_FIX_1205_TD_STEREO_MOD_CT
+        /* In TD stereo below 24.4 kbps we cannot overwrite the `coder_type` when it is set to TRANSITION, */
+        /* as it is used for TD stereo bit allocation. To ensure consistent bit allocation, it must remain unchanged on the decoder side. */
+        if ( st->idchan == 0 && !( element_brate <= IVAS_16k4 && st->coder_type == TRANSITION && st->element_mode == IVAS_CPE_TD ) )
+        {
+            st->coder_type = AUDIO;
+        }
+#else
         st->coder_type = AUDIO;
+#endif
+
         st->sp_aud_decision2 = 0;
 
         if ( st->low_rate_mode )
@@ -465,6 +476,16 @@ void ivas_signaling_enc(
 
                 if ( st->core == ACELP_CORE )
                 {
+#ifdef NONBE_FIX_1205_TD_STEREO_MOD_CT
+                    /* write coder type */
+                    push_indice( hBstr, IND_ACELP_SIGNALLING, st->coder_type, 3 );
+
+                    if ( element_brate >= FRMT_SHP_MIN_BRATE_IVAS )
+                    {
+                        /* write sharpening flag */
+                        push_indice( hBstr, IND_SHARP_FLAG, st->sharpFlag, 1 );
+                    }
+#else
                     if ( element_brate < FRMT_SHP_MIN_BRATE_IVAS )
                     {
                         push_indice( hBstr, IND_ACELP_SIGNALLING, st->coder_type, 3 );
@@ -477,6 +498,7 @@ void ivas_signaling_enc(
                         /* write sharpening flag */
                         push_indice( hBstr, IND_SHARP_FLAG, st->sharpFlag, 1 );
                     }
+#endif
 
                     /* write extension layer flag to distinguish between TBE (0) and BWE (1) */
                     if ( st->extl_brate > 0 )
diff --git a/lib_enc/ivas_stereo_td_enc.c b/lib_enc/ivas_stereo_td_enc.c
index 701035cc9fc01d8f824d225bb09e7b47b2317a49..5ba900a6aa9f44f6ab2a4fd94a148db63a603d26 100644
--- a/lib_enc/ivas_stereo_td_enc.c
+++ b/lib_enc/ivas_stereo_td_enc.c
@@ -449,6 +449,22 @@ void tdm_configure_enc(
     }
 
     mod_ct = AUDIO;
+#ifdef NONBE_FIX_1205_TD_STEREO_MOD_CT
+    if ( hCPE->element_brate < IVAS_24k4 )
+    {
+        /* In TD stereo, the TRANSITION mode has a specific bit allocation. All other formats share the same bit allocation. For these other formats, `mod_ct` is set to AUDIO to aid in debugging, though it does not have any functional impact. */
+        if ( !( sts[0]->localVAD == 0 && sts[0]->coder_type == TRANSITION ) &&
+             ( sts[0]->coder_type == TRANSITION ||
+               ( ( ( sts[0]->last_L_frame >= L_FRAME16k && sts[0]->flag_ACELP16k == 0 ) ||
+                   ( sts[0]->last_L_frame == L_FRAME && sts[0]->flag_ACELP16k == 1 ) ) &&
+                 sts[0]->last_core_brate != FRAME_NO_DATA &&
+                 sts[0]->last_core_brate != SID_2k40 &&
+                 sts[0]->coder_type_raw != VOICED ) ) )
+        {
+            mod_ct = TRANSITION;
+        }
+    }
+#else
     if ( hCPE->element_brate < IVAS_24k4 )
     {
         mod_ct = sts[0]->coder_type;
@@ -462,6 +478,7 @@ void tdm_configure_enc(
             mod_ct = AUDIO;
         }
     }
+#endif
 
     /* Correction of tdm_inst_ratio_idx in case of TC in the seecondary channel */
     if ( hStereoTD->flag_skip_DMX == 0 && hStereoTD->tdm_LRTD_flag == 1 && sts[1]->tc_cnt > 1 /*&& abs(hStereoTD->tdm_inst_ratio_idx-LRTD_STEREO_MID_IS_PRIM) > 5*/ )
@@ -549,7 +566,6 @@ void tdm_configure_enc(
 #ifdef DEBUG_MODE_TD
     dbgwrite( &hStereoTD->tdm_low_rate_mode, 2, 1, 320, "res/tdm_low_rate_mode_c" );
     dbgwrite( &hStereoTD->tdm_lp_reuse_flag, 2, 1, 320, "res/tdm_lp_reuse_flag_c" );
-    dbgwrite( &mod_ct, 2, 1, 320, "res/mod_ct.enc" );
 #endif
 
     /*----------------------------------------------------------------*