Quarkus Maven Plugin for v2.13.2 fails with Flattened POM

[kjq]

Describe the bug

This just happened when Renovate when to pull the latest version of Quarkus and perform the build - it says it cannot resolve the `.flattened-pom.xml".

We have not had any problems with Maven or the Maven Flatten Plugin or the Quarkus Maven Plugin before.

[ERROR] Failed to execute goal io.quarkus:quarkus-maven-plugin:2.13.2.Final:generate-code-tests (default) on project PROJECT: Quarkus code generation phase has failed: Failed to initialize Quarkus bootstrap Maven artifact resolver: Failed to load current project at /home/NAME/work/PROJECT/client/target/.flattened-pom.xml: Cannot invoke "java.io.File.toPath()" because the return value of "org.apache.maven.model.Model.getProjectDirectory()" is null -> [Help 1]

Ill watch to see if it was just a blip on the CI/CD side but wanted to point it out...

Expected behavior

Recognizes the POM as before and completes the Maven build.

Actual behavior

Cannot resolve the .flattened-pom.xml generated using the Maven Flatten Plugin

Output of java -version

17

Quarkus version or git rev

2.13.2.Final

Build tool (ie. output of mvnw --version or gradlew --version)

Maven v3.8.4

Additional information

Sometimes resolving all the artifacts with a new release gives us a red herring so it may be that. Will watch/close if it is not.

[quarkus-bot]

/cc @quarkusio/devtools @aloubyansky

[aloubyansky]

This is a duplicate of #28541, which has already been fixed in #28542. Sorry about that.