Does cloudflared preserve the Referer header?

[zhx57]

I am using cloudflared to expose my web application. My application's CSRF protection middleware relies on validating the Referer header.
I am experiencing CSRF validation failures when requests are routed through the tunnel, which leads me to believe the original Referer header from the client is being modified or stripped before it reaches my origin server.
If it is modified or removed, is there a configuration setting to preserve the original Referer header?