I don’t know about that one but I’ve seen other caching systems in place where people had been going in circles for 18 months and couldn’t give instructions as to how to build the system reliably and my first step was to clear everything out and start from zero because slow progress is better than no progress.

don't tar everything with the same brush.

as an aside, passing unique build / vcs / version ids as preprocessor directives are a great way to stymie these kind of systems.