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Gradle 6.5 build fails on Java 15-ea with Execution failed for task ':jar'. java.util.ConcurrentModificationException (no error message)

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0. Use '--warning-mode all' to show the individual deprecation warnings.
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Spring boot java gradle is a non-project file, only syntax errors are reported

java.util.concurrent.CompletionException: org.eclipse.lsp4j.jsonrpc.ResponseErrorException: org.gradle.tooling.BuildException: Could not fetch model of type ...