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Incorrect scheme set while proxying to a http/2 cleartext (h2c) backend


I am using HA-Proxy version 1.9.4 2019/02/06 for proxying HTTP/2 cleartext (h2c) traffic to a h2c backend. I am however seeing HA-Proxy set the :scheme https when proxying the request. When I hit the backend directly, the :scheme is set to http. I have verified this using wireshark (please see attached images).

Any suggestions on what I should change in my configuration so that I can set to make sure that the :scheme gets set to http while proxying the request?

I am using curl 7.54.0 to make requests:
$ curl --http2-prior-knowledge http://localhost:9090

My HA-Proxy config file:
maxconn 4096

log global
option http-use-htx
timeout connect 10s
timeout client 30s
timeout server 30s
maxconn 3000

frontend waiter
mode http
bind *:9090 proto h2
default_backend local_node

backend local_node
mode http
server localhost localhost:8080 proto h2


Any suggestions on how to get h2c working to the backend in this scenario (using mode http)?