AspectJ plugin is not compatible with configuration cache

[Cazayus]

While trying the new configuration cache feature of gradle, I stumbled upon a weird error :
■⚠️cannot serialize object of type org.gradle.api.internal.tasks.DefaultSourceSet📋, a subtype of org.gradle.api.tasks.SourceSet📋, as these are not supported with the configuration cache.

How to reproduce :

1. Create an empty project and apply the aspectJ plugin (io.freefair.aspectj:6.5.1)
2. Call the processResources task with configuration cache activated thusly : gradle --configuration-cache processResources

The error redirects to this page of the documentation.

While looking at the code of the AspectJ Plugin, I did not find anything referencing specifically processResources.
I wonder if maybe we are not supposed to use org.gradle.api.tasks.SourceSet anymore ?