MicroProfile Metrics tests started to fail since changes in ConfigSource

WildFly build: 21.0.0.Beta1-SNAPSHOT
Java: oracle-java-11

A several failures appeared in our small standalone test suite [1] for MicroProfile on WF/EAP. To be more specific, a few failures in MP Metrics that have one common cause:

java.lang.RuntimeException: config.source.properties.path property not defined

caused by line [2].

I have a reason to believe that this PR [3] could be reason of these failures. What should be done in this case?

Thank you.

[1] - https://github.com/jboss-eap-qe/eap-microprofile-test-suite/tree/master/microprofile-metrics/src/test/java/org/jboss/eap/qe/microprofile/metrics
[2] - https://github.com/jboss-eap-qe/eap-microprofile-test-suite/blob/8b726042e5b46540419263e81106da4c18abfb9c/microprofile-metrics/src/main/java/org/jboss/eap/qe/microprofile/metrics/integration/config/CustomConfigSource.java#L20
[3] - https://github.com/wildfly/wildfly/pull/13247