Bug: Compiler allows an extra colon in a case statement with an enum value

The following code, with an extra colon in the case statement, compiles without error and produces unexpected results at runtime.
If NUMBER_ZERO is changed to 0 in the case statement, it fails to compile as expected.

enum { NUMBER_ZERO, NUMBER_ONE, NUMBER_TWO }

var n = NUMBER_ZERO;
switch (n) {
    case: NUMBER_ZERO: // Note the extra colon
        System.println("case NUMBER_ZERO:");
        break;
    default:
        System.println("default:");
        break;
}
System.println("after switch(), n = " + n);

Output:

default:
after switch(), n = 0

Connect IQ SDK 4.2.1
Visual Studio Code Monkey C v1.0.8
Visual Studio Code Version 1.76.0 on Windows 11