diff --git a/core/src/main/java/ai/timefold/solver/core/impl/domain/solution/descriptor/SolutionDescriptor.java b/core/src/main/java/ai/timefold/solver/core/impl/domain/solution/descriptor/SolutionDescriptor.java
index 5913547d3fa..08d00e6f656 100644
--- a/core/src/main/java/ai/timefold/solver/core/impl/domain/solution/descriptor/SolutionDescriptor.java
+++ b/core/src/main/java/ai/timefold/solver/core/impl/domain/solution/descriptor/SolutionDescriptor.java
@@ -166,6 +166,10 @@ public static <Solution_> SolutionDescriptor<Solution_> buildSolutionDescriptor(
             solutionDescriptor.constraintWeightSupplier.initialize(solutionDescriptor,
                     descriptorPolicy.getMemberAccessorFactory(), descriptorPolicy.getDomainAccessType());
         }
+        // Temporally disabling the mixed model
+        if (solutionDescriptor.hasBothBasicAndListVariables()) {
+            throw new IllegalStateException("Combining list variable and basic variables is currently not supported.");
+        }
         return solutionDescriptor;
     }
 
diff --git a/core/src/test/java/ai/timefold/solver/core/impl/constructionheuristic/DefaultConstructionHeuristicPhaseTest.java b/core/src/test/java/ai/timefold/solver/core/impl/constructionheuristic/DefaultConstructionHeuristicPhaseTest.java
index f904fb90460..2ca4bbacced 100644
--- a/core/src/test/java/ai/timefold/solver/core/impl/constructionheuristic/DefaultConstructionHeuristicPhaseTest.java
+++ b/core/src/test/java/ai/timefold/solver/core/impl/constructionheuristic/DefaultConstructionHeuristicPhaseTest.java
@@ -47,6 +47,7 @@
 import ai.timefold.solver.core.testutil.AbstractMeterTest;
 import ai.timefold.solver.core.testutil.PlannerTestUtils;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import io.micrometer.core.instrument.Metrics;
@@ -348,6 +349,7 @@ void constructionHeuristicAllocateToValueFromQueue() {
                 .filter(e -> e.getValue() == null)).isEmpty();
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void failMixedModelDefaultConfiguration() {
         var solverConfig = PlannerTestUtils
diff --git a/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListChangeMoveSelectorFactoryTest.java b/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListChangeMoveSelectorFactoryTest.java
index 7f034b035f5..809d0efa443 100644
--- a/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListChangeMoveSelectorFactoryTest.java
+++ b/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListChangeMoveSelectorFactoryTest.java
@@ -20,6 +20,7 @@
 import ai.timefold.solver.core.testdomain.list.TestdataListSolution;
 import ai.timefold.solver.core.testdomain.mixed.multientity.TestdataMixedMultiEntitySolution;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -43,6 +44,7 @@ void buildMoveSelector() {
         assertThat(selector.isSelectReversingMoveToo()).isTrue();
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void buildMoveSelectorMultiEntity() {
         var config = new SubListChangeMoveSelectorConfig();
diff --git a/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListSwapMoveSelectorFactoryTest.java b/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListSwapMoveSelectorFactoryTest.java
index 12422e928d1..b388c6d70f1 100644
--- a/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListSwapMoveSelectorFactoryTest.java
+++ b/core/src/test/java/ai/timefold/solver/core/impl/heuristic/selector/move/generic/list/SubListSwapMoveSelectorFactoryTest.java
@@ -16,6 +16,7 @@
 import ai.timefold.solver.core.testdomain.list.TestdataListSolution;
 import ai.timefold.solver.core.testdomain.mixed.multientity.TestdataMixedMultiEntitySolution;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -40,6 +41,7 @@ void buildBaseMoveSelector() {
         assertThat(selector.isSelectReversingMoveToo()).isTrue();
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void buildMoveSelectorMultiEntity() {
         var config = new SubListSwapMoveSelectorConfig();
diff --git a/core/src/test/java/ai/timefold/solver/core/impl/solver/DefaultSolverTest.java b/core/src/test/java/ai/timefold/solver/core/impl/solver/DefaultSolverTest.java
index a199116cc21..3e38ae69574 100644
--- a/core/src/test/java/ai/timefold/solver/core/impl/solver/DefaultSolverTest.java
+++ b/core/src/test/java/ai/timefold/solver/core/impl/solver/DefaultSolverTest.java
@@ -146,6 +146,7 @@
 import org.assertj.core.api.junit.jupiter.SoftAssertionsExtension;
 import org.jspecify.annotations.NonNull;
 import org.jspecify.annotations.Nullable;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -1656,6 +1657,19 @@ private static List<MoveSelectorConfig> generateMovesForMultiEntity() {
         return allMoveSelectionConfigList;
     }
 
+    @Test
+    void failMixedModel() {
+        var solverConfig = PlannerTestUtils
+                .buildSolverConfig(TestdataMixedSolution.class, TestdataMixedEntity.class, TestdataMixedValue.class,
+                        TestdataMixedOtherValue.class)
+                .withPreviewFeature(DECLARATIVE_SHADOW_VARIABLES);
+
+        assertThatCode(() -> PlannerTestUtils.solve(solverConfig, new TestdataSolution("s1")))
+                .hasMessageContaining(
+                        "Combining list variable and basic variables is currently not supported");
+    }
+
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solveMixedModel() {
         // Same size for both list and basic variables
@@ -1667,6 +1681,7 @@ void solveMixedModel() {
         executeSolveMixedModel(3, 2, 2);
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solveMultiEntityMixedModel() {
         // Same size for both list and basic variables
@@ -1749,6 +1764,7 @@ void executeSolveMultiEntityMixedModel(int entitySize, int valueSize, int otherV
         }
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solveMixedModelCustomMove() {
         var solverConfig = PlannerTestUtils.buildSolverConfig(
@@ -1773,6 +1789,7 @@ void solveMixedModelCustomMove() {
                 .isEmpty();
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solveMixedModelCustomPhase() {
         var solverConfig = PlannerTestUtils.buildSolverConfig(
@@ -1805,6 +1822,7 @@ private static List<Pair<EntitySorterManner, ValueSorterManner>> getSortMannerLi
         return sortMannerList;
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @ParameterizedTest
     @MethodSource("getSortMannerList")
     void solveMixedModelWithSortManner(Pair<EntitySorterManner, ValueSorterManner> sorterManner) {
@@ -1838,6 +1856,7 @@ void solveMixedModelWithSortManner(Pair<EntitySorterManner, ValueSorterManner> s
                 .isEmpty();
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solvePinnedMixedModel() {
         // We don't enable the LS because we want to ensure the pinned entity remains uninitialized
@@ -1861,6 +1880,7 @@ void solvePinnedMixedModel() {
         assertThat(solution.getEntityList().get(0).getValueList()).isEmpty();
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solveUnassignedMixedModel() {
         var solverConfig = PlannerTestUtils.buildSolverConfig(
@@ -1887,6 +1907,7 @@ void solveUnassignedMixedModel() {
                 .hasSize(2);
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @Test
     void solvePinnedAndUnassignedMixedModel() {
         var solverConfig = PlannerTestUtils.buildSolverConfig(
@@ -1974,6 +1995,7 @@ private static List<MoveSelectorConfig> generateMovesForMixedModel() {
         return allMoveSelectionConfigList;
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @ParameterizedTest
     @MethodSource("generateMovesForMixedModel")
     void solveMoveConfigMixedModel(MoveSelectorConfig moveSelectionConfig) {
@@ -2036,6 +2058,7 @@ private static List<MoveSelectorConfig> generateMovesForMultiEntityMixedModel()
         return allMoveSelectionConfigList;
     }
 
+    @Disabled("The mixed model is currently unavailable for general use")
     @ParameterizedTest
     @MethodSource("generateMovesForMultiEntityMixedModel")
     void solveMultiEntityMoveConfigMixedModel(MoveSelectorConfig moveSelectionConfig) {