chrome extension shows site is http/3 enabled but shows otherwise

I have installed openlitespeed webserver for my website ( and enabled http/3 at all levels. The problem is that the http/3 indicator extension on chrome browser is showing "green" for my website but shows that the site is not http/3 enabled. It prints an error "QUIC connection could not be established".
The tooltip on the chrome browser extension shows "SPDY-enabled ( h3) ". I am wondering who is right and who is not. The extension shows green indicator for all the subdomains as well.
Please advise and share your expertise.