I'm trying to publish a plugin, and using the Shadow plugin, but I'm getting an error

Please configure the

shadowJar

task to not add a classifier to the jar it produces

The Publish Plugin docs say it should just work

Starting with version 1.0.0 the Plugin Publish plugin can automatically interact with the com.github.johnrengelman.shadow plugin, if applied. It will automatically publish the jar produced by the

shadowJar

task, as the main artifact. Note that this interaction requires the usage of Gradle v6.0.1 or later, in order to work properly.

I'm using Publish Plugin v1.1.0, Shadow v8.1.0, and Gradle v8.0.1. So what am I missing?