It just serves the other ionic serve’s build. Trying a different port didnt help.
EDIT: currently I am able to bypass this by adding --dev-logger-port 53704 --livereload-port 35730 --port 8200
That is an interesting problem.
Are you trying to ionic serve in two different projects at the same time? Or twice the same project?
Two different projects.
See here: https://github.com/ionic-team/ionic-cli/issues/2602
There are also a load of topics about it here in the forum, but noone added to the issue on Github or created additional ones if their problem is different. You should do that.