Java-19 Switch / Source Compat Problem

MySwitch.java

package blo;

public class MySwitch {
	
	public interface NamedItem {
		public String name();
	}
	
	public static class MyTypeA /* implements NamedItem*/ {
		private final String value;
		
		public MyTypeA(String value) {
			this.value = value;
		}
		
		public String name() {
			return this.value;
		}
	}

	
	public static class MyTypeB implements NamedItem {
		private final String value;

		public MyTypeB(String value) {
			this.value = value;
		}

		public String name() {
			return this.value;
		}
	}
	
	static class ExtractSwitch {
		static String extractName(Object o) {
			return switch( o ) {
				case NamedItem item -> item.name();
				case MyTypeA t -> t.name();
				default -> o.toString();
			};
		}
	}
	
	static class ExtractMethod {
		static String extractName(NamedItem item) {
			return item.name();
		}
		
		static String extractName(MyTypeA item) {
			return item.name();
		}
		
		static String extractName(Object o) {
			return o.toString();
		}		
	}
	
	static class ExtractIf {
		static String extractName(Object o) {
			if( o instanceof NamedItem item ) {
				return item.name();
			} else if( o instanceof MyTypeA t ) {
				return t.name();
			} else {
				return o.toString();
			}
		}
	}
	
	public static void main(String[] args) {
		System.err.println(ExtractSwitch.extractName(new MyTypeA("MyType")));
		System.err.println(ExtractSwitch.extractName(new MyTypeB("MyTypeX")));
		System.err.println(ExtractSwitch.extractName(new Object()));
		
		System.err.println("----");
		
		System.err.println(ExtractMethod.extractName(new MyTypeA("MyType")));
		System.err.println(ExtractMethod.extractName(new MyTypeB("MyTypeX")));
		System.err.println(ExtractMethod.extractName(new Object()));

		System.err.println("----");
		
		System.err.println(ExtractIf.extractName(new MyTypeA("MyType")));
		System.err.println(ExtractIf.extractName(new MyTypeB("MyTypeX")));
		System.err.println(ExtractIf.extractName(new Object()));

	}
}