I had a similar problem with PyCharm FastAPI. When introducing a change, it used to get stuck on reload. (most likely couldn't kill the current process.) The server was still running on the old version, although I could see it is trying to reload.

However, I could resolve it by just using the terminal and running

uvicorn main:app --reload

It then worked like a charm.

You should not use the FastAPI launcher. Instead launch it directly by Uvicorn.

I noticed that no matter what I do in "Run/Debug Configuration" of PyCharm, it won't be fixed there. I.E. if I choose Uvicorn in "Run/Debug Config" window of PyCharm, I still face the same problem, it does not reload. For me it works only when I launch the server from the terminal using Uvicorn.