Aggregation plugin fails to find plugins it depends on

I’ve got several plugins which provide certain functionality. One plugin is used as a meta plugin which just pulls in and applies a default set of the others. All plugins are published to the portal and show up as released and active, however the download fails.

build.gradle:

plugins {
    id "de.kotka.clojuresque.clojure" version "2.0.0"
}

Running this, gives the following error:

> Could not resolve all dependencies for configuration ':classpath'.
   > Could not find de.kotka.clojuresque:clojuresque-common:2.0.0.
     Searched in the following locations:
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-common/2.0.0/clojuresque-common-2.0.0.pom
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-common/2.0.0/clojuresque-common-2.0.0.jar
     Required by:
         :pyrrhus2.0:unspecified > gradle.plugin.de.kotka.clojuresque:clojuresque-base:2.0.0
         :pyrrhus2.0:unspecified > gradle.plugin.de.kotka.clojuresque:clojuresque-nrepl:2.0.0
   > Could not find de.kotka.clojuresque:clojuresque-base:2.0.0.
     Searched in the following locations:
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-base/2.0.0/clojuresque-base-2.0.0.pom
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-base/2.0.0/clojuresque-base-2.0.0.jar
     Required by:
         :pyrrhus2.0:unspecified > gradle.plugin.de.kotka.clojuresque:clojuresque-nrepl:2.0.0
         :pyrrhus2.0:unspecified > gradle.plugin.de.kotka.clojuresque:clojuresque:2.0.0
   > Could not find de.kotka.clojuresque:clojuresque-nrepl:2.0.0.
     Searched in the following locations:
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-nrepl/2.0.0/clojuresque-nrepl-2.0.0.pom
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-nrepl/2.0.0/clojuresque-nrepl-2.0.0.jar
     Required by:
         :pyrrhus2.0:unspecified > gradle.plugin.de.kotka.clojuresque:clojuresque:2.0.0
   > Could not find de.kotka.clojuresque:clojuresque-extras:2.0.0.
     Searched in the following locations:
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-extras/2.0.0/clojuresque-extras-2.0.0.pom
         https://plugins.gradle.org/m2/de/kotka/clojuresque/clojuresque-extras/2.0.0/clojuresque-extras-2.0.0.jar
     Required by:
         :pyrrhus2.0:unspecified > gradle.plugin.de.kotka.clojuresque:clojuresque:2.0.0

All these are supposed to be available.
https://plugins.gradle.org/search?term=de.kotka.clojuresque

And in fact using the plugins without dependency on other plugins (eg. de.kotka.clojuresque.common) works well.

What am I doing wrong?

Further note:

Using the old-fashioned way with my bintray repo works as expected.

buildscript {
    repositories {
        maven { url "https://dl.bintray.com/kotarak/clojuresque" }
        jcenter()
    }
    dependencies {
        classpath "de.kotka.clojuresque:clojuresque-base:2.0.0"
        classpath "de.kotka.clojuresque:clojuresque-nrepl:2.0.0"
    }
}

apply plugin: "de.kotka.clojuresque.base"
apply plugin: "de.kotka.clojuresque.nrepl"