REPRODUCER:

import java.nio.file.Path;
import java.time.Duration;

import jdk.jfr.*;
import jdk.jfr.consumer.*;

public class WAT {

    @Name("F")
    @StackTrace(false)
    static class A extends Event {
    }

    @Name("FF")
    @StackTrace(false)
    static class B extends Event {
    }

    public static void main(String... args) throws Exception {
        try (Recording r = new Recording()) {
            r.enable("F").withStackTrace();
            r.enable("FF").withStackTrace();
            r.start();
            A a = new A();
            a.commit();
            B b = new B();
            b.commit();
            r.stop();
            Path p = Path.of("wat.jfr");
            r.dump(p);
            for (RecordedEvent e : RecordingFile.readAllEvents(p)) {
                System.out.println(e);
            }
        }
    }
}
OUTPUT:

F {
  startTime = 10:40:54.209
  eventThread = "main" (javaThreadId = 1)
}


FF {
  startTime = 10:40:54.213
  eventThread = "main" (javaThreadId = 1)
  stackTrace = [
    WAT.main(String[]) line: 28
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Method, Object, Object[])
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Object, Object[]) line: 62
    jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
    java.lang.reflect.Method.invoke(Object, Object[]) line: 566
    ...
  ]
}

The problem is a one-off error in the SettingsManager.