Unable to setup HTTP/3

I installed OpenLiteSpeed Web Server 1.7.17 on Ubuntu 22.04.2 and Enabled HTTP/2 and HTTP/3 in all levels (server, listener, virtualhost) for included example site. However the site is loading with HTTP/2 only, I can see alt-svc advertising h3 Alt-Svc: h3=":443"; ma=2592000

What am I missing here?