According to org.jboss.as.test.layers.LayersTestCase results, org.slf4j.ext and ch.qos.cal10n modules are not provisioned.

The modules have been removed from upstream [1], but returned back during the conversion from upstream [2]. It seems the issue comes from different runtime dependency setting in org.jboss.as.logging.LoggingModuleDependency [1], which is now RuntimePackageDependency.passive(SLF4J_EXT.moduleName) but used to be RuntimePackageDependency.optional("org.slf4j.ext"). Changing it back to optional helps and the test passes.

[1] https://github.com/wildfly/wildfly-core/pull/4117/files#diff-8b62383ebb2ccdcb97a31482557b167e2b33777deb35a3521df091d50ae25a7cL215