Yes. Lack of reading is observable even inside code bases themselves.

Some contributors are more prone than others to not read the codebase they're working on and break patterns, use different file naming and folder structures, disregard currently existing code and re-implementing things from scratch, use a completely different code style, use tabs instead of spaces.

I don't think it's fair to assume that those people are doing this out of malice, or even to push their own style, because as soon as you mention that to them, they admit they were just not paying attention.