Port 5000 blocked by ControlCenter on M4 Pro Mac (403 from browser/Postman)

I'm running a Node.js server on my MacBook with Apple M4 Pro chip, macOS Sequoia 15.4, and Node.js v23.10.0.

The server starts normally on port 5000 and logs show that it's listening correctly. However, when I try to access it via browser or Postman (http://localhost:5000/api/...), I get a 403 Forbidden error.

After checking with lsof -i :5000, I noticed that the ControlCenter process is listening on port 5000 under the name commplex-main.

Interestingly, this doesn't happen on M3 Pro machines. On those devices, Node.js runs fine on port 5000 and can be accessed from Postman and browsers.

Is port 5000 now internally reserved by macOS or used by some system-level service in Sequoia or Apple Silicon (M4 Pro)?
Should I avoid using this port going forward?

Any official clarification would be appreciated.