Tunnel is converting all HTTP request methods to GETs

I recently used the web interface to create a new tunnel to expose a locally running HTTP service to the public internet. Everything seemed to go smoothly, and I could begin to hit the server through a subdomain as intended. However, all HTTP requests seem to have their methods converted to GETs - which is undesirable. I’ve cranked up logging on cloudflared and it seems all requests it receives are GET, so at this point, I’m unsure how to debug further.

I am using the latest version of the Cloudflare/cloudflared docker container, and the service being exposed is running on a separate piece of discrete hardware on the LAN