Reject bean names with factory prefix for Bean Overrides

Closes gh-33674

spring-test/src/test/java/org/springframework/test/context/bean/override/BeanOverrideBeanFactoryPostProcessorTests.java

@@ -56,6 +56,18 @@ import static org.mockito.Mockito.mock;
  */
 class BeanOverrideBeanFactoryPostProcessorTests {
 
+	@Test
+	void beanNameWithFactoryBeanPrefixIsRejected() {
+		AnnotationConfigApplicationContext context = createContext(FactoryBeanPrefixTestCase.class);
+
+		assertThatIllegalStateException()
+				.isThrownBy(context::refresh)
+				.withMessage("""
+					Unable to override bean '&messageService' for field 'FactoryBeanPrefixTestCase.messageService': \
+					a FactoryBean cannot be overridden. To override the bean created by the FactoryBean, remove the \
+					'&' prefix.""");
+	}
+
 	@Test
 	void replaceBeanByNameWithMatchingBeanDefinition() {
 		AnnotationConfigApplicationContext context = createContext(CaseByName.class);
@@ -348,6 +360,18 @@ class BeanOverrideBeanFactoryPostProcessorTests {
 	}
 
 
+	@FunctionalInterface
+	interface MessageService {
+		String getMessage();
+	}
+
+	static class FactoryBeanPrefixTestCase {
+
+		@DummyBean(beanName = "&messageService")
+		MessageService messageService;
+
+	}
+
 	static class CaseByName {
 
 		@DummyBean(beanName = "descriptionBean")
@@ -464,11 +488,6 @@ class BeanOverrideBeanFactoryPostProcessorTests {
 		}
 	}
 
-	@FunctionalInterface
-	interface MessageService {
-		String getMessage();
-	}
-
 	static class MessageServiceTestCase {
 
 		@TestBean(name = "messageServiceBean")