For whatever reason, port forwarding is broken on 22.03.5
It doesn't matter what port number in "internal port" or "external port" - both will be marked red and the save button is thus disabled.
Maybe you can show us the specifics of what you are trying to do - this doesn’t appear to be a universal problem.
Sounds like you’re using the web interface to enter the port forward? If so, a screenshot would be useful. Please also provide your configs in text form.
Please copy the output of the following commands and post it here using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have: