I can't get different Nuxt3 node applications to run on my Plesk server on 2 different domains.

I have stored both separately (and both are accessible individually) but as soon as the second one is added (or updated) the first instance is no longer accessible (504 Gateway Time-Out). I suspect it's because of the ports? But I have already added PORT as an env variable (once 3000 and once 3001). Unfortunately, I can't find a solution anywhere.

Image is in German but i think you get it

Settings in Plesk

I tried specifying the port, but that didn't help. I assume it's a setting issue in Nuxt or Plesk?