Http/3 is not supported even though it is enabled in Cloudflare

Even though under network settings in Cloudflare the http/3 option is enabled when I check my domain it is doesn’t support http/3 as you can see here:

What is more weird is that I have 2 subdomains and one supports http/3 and the other isn’t.

What should I do in order they both will support http/3 and why there is a difference between them?

This is odd. I will note that I can reproduce it here though, I only get https/2 whereas I get http/3 on other Cloudflare sites. Nonetheless, it is offering h3:

alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

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