Unexpected WebRTC Extension Import Error Message

Godot Version

4.3.0 Stable

Question

I am creating a small 1v1 networked game. I am creating it primarily for web, but I also want to be able to create working Windows builds. This is the first time I am building a networked game, so I am not that familiar with WebRTC or Websockets.
When I create a web export for the game, I expect WebRTC to work out-of-the-box, without any need for extensions (since it states as such in the documentation). I do have the WebRTC extension in my project in case I want to export to another platform. However, when I start my exported project, I get the following error messages:

Can anybody explain what is going on and how I can prevent this error from showing up?

I already tried to exclude the webrtc folder in my Web export settings. With and without this exclusion the error occurs.