Err looks like the separate

metadata

default artifact was removed in Kotlin 1.4.20, but I'm still seeing it when listing out the default publication names.

publishing {
    publications.withType<MavenPublication>().names // [jvm, kotlinMultiplatform, metadata]
}

Should I just manually set it to not publish the

metadata

artifact, or will it be ignored during the publish task?

I've tried a few local publishes on my 1.4.20 testing, and have not seen the separate Metadata. It shouldn't cause any issues.