Yes, it’s a bad practice. It’s a “boiling frog”. You have this monorepo, but it’s small, only 5 services. So, you add another one. And another. And before you notice, you end up with a distributed monolith.
Of course I don’t know anything about your system. Microservices can go wrong in many ways. Nano-services. Entity-services. You name it. But having a monorepo is a recipe for disaster.