Removing the assigned port for the web server in target settings resolved all my issues, thank you so much for the help.
However, I was wondering what might have caused this in the first place? The configuration me and my team use did not change, yet this error appeared for the first time last Tuesday. Before that, we had been deploying without issues using Traefik even with the port specified. Did anything change in version 3.9.9 or do you have any other idea of what might have caused this in the first place?