.gitignore file should include .cache/

No. This is not a feature request. This is reporting a bug carelessly made at ver 8.2.0.

  • Improved responsiveness and loading time for big projects in Katalon Studio. Results from our benchmarking tests show: renaming/opening test cases 2x faster, moving test cases 1.5x faster.

Katalon team introduced the .cache/ folder newly at v8.2.0. You should have changed the default .gitignore file at the same time, but you didn’t. I regard it is a bug caused by your carelessness.