Quarkus guidelines are for having Native image test in this form:

import io.quarkus.test.junit.SubstrateTest;

@SubstrateTest
public class NativeByNameDMNEndpointIT extends ByNameDMNEndpointTest {

    // Execute the same tests but in native mode.
}

When the dmn example is inheriting from the submarine-examples bom, it causes those IT-ending tests to run anyway even on normal JVM.
See this commit exhibit the issue even locally: https://github.com/kiegroup/submarine-examples/pull/15/commits/1bdd53d89fed28821d21d29fd610402761463514

Removing the pom inheritance, the test behavior is back Quarkus guideline