Hi @liblit,
You are running into this (breaking) change:
https://docs.gradle.org/current/userguide/upgrading_version_5.html#maven_or_ivy_repositories_are_no_longer_queried_for_artifacts_without_metadata_by_default
It’s a performance optiomization that now assumes that all Maven repositories follow the standard Maven layout (i.e. there always is a maven-metadata.xml and poms)
You need to add the artifact() metadata sources to the p2asmaven repository declaration to tell Gradle that the repo is not always following these conventions.