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How are you applying the shadowJar plugin? Is it possible you aren't specifying a specific version of it, and clearing everything out has upgraded it?

Applying it using plugins {} and then it gets the version from gradle.properties

You are not using Gradle 7.5.1 as you stated, but 8.2 where `classifier` does not exist anymore. You can see this in the help link of your failure. If you are not using the Gradle wrapper, you should.