Why are the *IT.java integration tests not found by maven-failsafe-plugin?

Question

I have created some integration tests in a java project and I would like to run them with maven-failsafe-plugin but when I try to do so by running mvn clean install, the tests are not executed. Here is my setup:

I have a multimodule maven project. I use junit5 for testing and my unit tests are executed correctly with maven-surefire-plugin. I can see that the integration tests are compiled as well and I can find them in target/test-classes.

Here are distilled contents of my project files:

// /pom.xml

<dependencies>
   <dependency>
     <groupId>org.junit.jupiter</groupId>
     <artifactId>junit-jupiter</artifactId>
     <version>${junit-jupiter.version}</version>
     <scope>test</scope>
   </dependency>
   <dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-api</artifactId>
    <version>${junit-jupiter.version}</version>
    <scope>test</scope>
  </dependency>
</dependencies>
...
<build>
  <pluginManagement>
    <plugins>
      <plugin>
       ...
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-failsafe-plugin</artifactId>
       <version>${maven-failsafe-plugin.version}</version>
       <executions>
         <execution>
           <id>integration-test</id>
           <goals>
             <goal>integration-test</goal>
             <goal>verify</goal>
           </goals>
         </execution>
        </executions>
      </plugin>
      ...

In module pom:

// /submodule1/pom.xml
     <build>
        <plugins>
            ...
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

My test files have following path /submodule1/src/test/java/com/example/integrations/*IT.java Here is an example test file:

public class ClientIT {
  @Test
  public void callRemoteServerTest() {
    ...
  }  

When I run mvn clean install I can see the integration tests are not executed:

--- failsafe:3.2.5:integration-test (integration-test) @ submodule1 ---
[INFO] Using auto detected provider org.apache.maven.surefire.junitplatform.JUnitPlatformProvider
[INFO] 
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Tests run: 0, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] 
[INFO] --- failsafe:3.2.5:verify (integration-test) @ submodule1 ---
[INFO]

I thought that the files with **/*IT.java path should be executed by default. Why are they not?