Extension not working with 8.42 and certain rules

[future2r]

The extension 1.4.0 is not working with CheckStyle 8.42 in combination with certain rules. Everything works fine until we use a rule like "AbstractClassName". The extension fails with "Internal error occurred". After removing this rule, everything works fine again.

Interestingly, all rules work with the same extension but CheckStyle 8.40.

See the attached example workspace for testing.

Java 16.0.1
Windows 10
VS Code 1.56.2
checkstyle-test.zip