Previews are being redirected to https://_/page, indicating that somehow ProcessWire is using Nginx's server_name directive instead of its own config for URLs.
Additional info: I have only been able to test this going through another Nginx proxy, I'm unsure if this error happens when directly accessing ProcessWire. Needs testing.
Steps to reproduce:
Previews are being redirected to https://_/page, indicating that somehow ProcessWire is using Nginx's server_name directive instead of its own config for URLs.