diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index c3a163638b..40cffd2641 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -7318,7 +7318,7 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
         "brim_width", "brim_object_gap", "brim_flow_ratio", "brim_use_efc_outline", "combine_brims", "brim_type", "nozzle_diameter", "single_extruder_multi_material", "preferred_orientation",
         "enable_prime_tower", "wipe_tower_x", "wipe_tower_y", "prime_tower_width", "prime_tower_brim_width", "prime_tower_skip_points", "prime_tower_enable_framework",
         "prime_tower_infill_gap", "prime_volume",
-        "extruder_colour", "filament_colour", "filament_type", "material_colour", "printable_height", "extruder_printable_height", "printer_model", "printer_technology",
+        "extruder_colour", "filament_colour", "filament_type", "filament_is_support", "material_colour", "printable_height", "extruder_printable_height", "printer_model", "printer_technology",
         // These values are necessary to construct SlicingParameters by the Canvas3D variable layer height editor.
         "layer_height", "initial_layer_print_height", "min_layer_height", "max_layer_height",
         "wall_loops", "outer_wall_filament_id", "inner_wall_filament_id", "sparse_infill_density", "sparse_infill_filament_id", "top_shell_layers",
@@ -19661,6 +19661,7 @@ void Plater::on_config_change(const DynamicPrintConfig &config)
             update_scheduled = true; // update should be scheduled (for update 3DScene) #2738
 
             if (update_filament_colors_in_full_config()) {
+                p->sidebar->update_mixed_filament_list();
                 p->sidebar->obj_list()->update_filament_colors();
                 p->sidebar->update_dynamic_filament_list();
                 continue;
@@ -19668,6 +19669,15 @@ void Plater::on_config_change(const DynamicPrintConfig &config)
         }
         if (opt_key == "filament_type") {
             update_filament_colors_in_full_config();
+            p->sidebar->update_mixed_filament_list();
+            continue;
+        }
+        // The mixed-filament type check folds filament_is_support into the component type
+        // (DynamicPrintConfig::get_filament_type -> "PLA-S"), so a support-preset switch must
+        // refresh the list even though filament_type itself did not change.
+        if (opt_key == "filament_is_support") {
+            p->config->set_key_value(opt_key, config.option(opt_key)->clone());
+            p->sidebar->update_mixed_filament_list();
             continue;
         }
         if (opt_key == "material_colour") {
diff --git a/tests/libslic3r/test_filament_mixer.cpp b/tests/libslic3r/test_filament_mixer.cpp
index 7b5842334f..fb11fa9481 100644
--- a/tests/libslic3r/test_filament_mixer.cpp
+++ b/tests/libslic3r/test_filament_mixer.cpp
@@ -1,6 +1,7 @@
 #include <catch2/catch_all.hpp>
 
 #include "libslic3r/FilamentMixer.hpp"
+#include "libslic3r/PrintConfig.hpp"
 
 using namespace Slic3r;
 
@@ -98,6 +99,29 @@ TEST_CASE("check_mixed_filament_type_consistency flags mismatched component type
     REQUIRE(bad == std::vector<size_t>{2});
 }
 
+TEST_CASE("a support-flagged component reads as its own filament type for the consistency check", "[FilamentMixer]")
+{
+    // Sidebar::update_mixed_filament_list and Sidebar::has_broken_mixed_filament derive each
+    // component's type through DynamicPrintConfig::get_filament_type, which folds the
+    // filament_is_support flag into the type — so toggling that flag alone changes the verdict
+    // and Plater::on_config_change has to refresh the mixed list on filament_is_support too.
+    DynamicPrintConfig plain_pla;
+    plain_pla.set_key_value("filament_type", new ConfigOptionStrings({"PLA"}));
+    plain_pla.set_key_value("filament_is_support", new ConfigOptionBools({false}));
+    std::string displayed;
+    REQUIRE(plain_pla.get_filament_type(displayed) == "PLA");
+
+    DynamicPrintConfig support_pla;
+    support_pla.set_key_value("filament_type", new ConfigOptionStrings({"PLA"}));
+    support_pla.set_key_value("filament_is_support", new ConfigOptionBools({true}));
+    REQUIRE(support_pla.get_filament_type(displayed) == "PLA-S");
+    REQUIRE(displayed == "Sup.PLA");
+
+    const std::vector<unsigned char> is_mixed  = {0, 0, 1};
+    const std::vector<std::string>   comp_strs = {"", "", "1,2"};
+    REQUIRE(check_mixed_filament_type_consistency(is_mixed, comp_strs, {"PLA", "PLA-S"}) == std::vector<size_t>{2});
+}
+
 TEST_CASE("gradient curves round-trip and sample monotonically", "[FilamentMixer]")
 {
     SECTION("Empty input yields an empty curve") {