@CacheEntryActivated events received for keys not matching KeyFilter

I have a local-mode Cache<Object, ?>, for which I register a cache listener using the following KeyFilter:

class MyFIlter implements KeyFilter<Object> {
    @Override
    public boolean accept(Object key) {
        return key instanceof String;
    }
}

However, my listener method still receives events for keys that does not match the filter with which my listener was registered.
e.g.

    @CacheEntryActivated
    public void activated(CacheEntryActivatedEvent<String, ?> event) {
        String id = event.getKey();  // Throws a ClassCastException
        // ...
    }

I have not validated which other event types might exhibit the same issue.
Since this is a behavior regression, I'm filing this as critical.