Endpoint failing due to port attached to host using Reverse Proxy

Description

I am not sure if this is a bug or not, also curious about your opinion.
We have an endpoint that is not working with Reverse Proxy, because Proxyman sets the Host header as follows:

Host: example.com:443

The endpoint returns an error and only works when the Host is set like this:

Host: example.com

So without the port number behind it.
I am not too familiar with HTTP standards on this, if this is a Proxyman bug or if the endpoint is just too strict (there is no internal error, it is a 500 error returned by the endpoint).

I have the following workaround that fixes it for me:
In scripting tool I have set up the following script on this endpoint, so that the port is not sent:

URL: example.com/*
ANY / Use wildcard / Run Script on: Request

async function onRequest(context, url, request) {
  request.headers["Host"] = "example.com";
  return request;
}

• App version: e.g Proxyman 5.22.0, but I don't think the version matters
• macOS version: e.g macOS Monterey