Reproduced spring-projects/spring-boot#36997

src/main/java/org/example/service/MyService.java

@@ -0,0 +1,8 @@
+package org.example.service;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class MyService {
+
+}

src/test/java/org/example/MyApplicationTest.java → src/test/java/org/example/BaseTest.java

@@ -15,7 +15,7 @@
 @AutoConfigureMockMvc
 @Testcontainers
 @DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_CLASS)
-public class MyApplicationTest {
+public class BaseTest {
 
     @ServiceConnection
     private static final MySQLContainer<?> mySQLContainer;

src/test/java/org/example/FirstTest.java

@@ -0,0 +1,16 @@
+package org.example;
+
+import org.example.service.MyService;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class FirstTest extends BaseTest {
+
+    @Autowired
+    MyService myService;
+
+    @Test
+    void foo() {
+
+    }
+}

src/test/java/org/example/SecondTest.java

@@ -0,0 +1,16 @@
+package org.example;
+
+import org.example.service.MyService;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.mock.mockito.MockBean;
+
+public class SecondTest extends BaseTest {
+
+    @MockBean
+    MyService myService;
+
+    @Test
+    void foo() {
+
+    }
+}