Invocation exception for p2.asmaven plugin

I am trying to give the p2.asmaven Plugin a spin.

Gradle 7.2
Java 1.8 (in env + gradle.properties)
My build.gradle is:

plugins {
  id "com.diffplug.p2.asmaven" version "3.33.1"
  id 'java-library'
}

apply plugin: 'com.diffplug.p2.asmaven'
p2AsMaven {
    // the maven group they shall have
    group 'eclipse-deps', {
        // the repositories and artifacts to download
        repoEclipse '4.17.0'
        iu          'org.eclipse.jdt.core'
    }
}

dependencies {
    implementation 'eclipse-deps:org.eclipse.jdt.core:+'
}

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(8)
    }
}

version = '1.2.1'

I am getting this stack trace

with this being the interesting part I imagine:

Caused by: java.lang.SecurityException: Signers of 'org.osgi.service.log.LogLevel' do not match signers of other classes in package
        at org.eclipse.osgi.internal.log.EquinoxLogServices.<init>(EquinoxLogServices.java:94)
        at org.eclipse.osgi.internal.framework.EquinoxContainer.<init>(EquinoxContainer.java:78)
        at org.eclipse.osgi.launch.Equinox.<init>(Equinox.java:34)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:315)
        at com.diffplug.gradle.eclipserunner.EquinoxLauncher$Running.<init>(EquinoxLauncher.java:196)
        at com.diffplug.gradle.eclipserunner.EquinoxLauncher$Running.<init>(EquinoxLauncher.java:189)
        at com.diffplug.gradle.eclipserunner.EquinoxLauncher.open(EquinoxLauncher.java:174)
        at com.diffplug.gradle.eclipserunner.EquinoxLauncher.run(EquinoxLauncher.java:179)

Am I on the right track?
My goal is to use this plugin to package locally-built RCP product p2 artifacts into a local .m2 repo, so that other, purely maven-configured projects can resolve them and compile against them without fuzz.