HAProxy 2.0.5 accepting strict http2 request when bind line does not have proto h2

@tt100 wrote:

I tested with HAProxy 2.0.5 with following basic configuration using curl
curl -v --http2-prior-knowledge http://IP

global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
user haproxy
group haproxy
daemon
#maxconn 65536

defaults
log global
mode http
http-reuse never
no log
timeout connect 5000
timeout client 50000
timeout server 50000
errorfile 400 /etc/haproxy/errors/400.http
errorfile 403 /etc/haproxy/errors/403.http
errorfile 408 /etc/haproxy/errors/408.http
errorfile 500 /etc/haproxy/errors/500.http
errorfile 502 /etc/haproxy/errors/502.http
errorfile 503 /etc/haproxy/errors/503.http
errorfile 504 /etc/haproxy/errors/504.http

frontend test
bind :80
mode http
maxconn 65536
default_backend nginx

backend nginx
mode http
balance leastconn
server <IP> <IP>:81 weight 255

When tested with HAProxy 1.9.8, I get the following error:
http2 error: Remote peer returned unexpected data while we expected SETTINGS frame. Perhaps, peer does not support HTTP/2 properly.

Is this the expected behaviour?

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