xenstar
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xenstar's post in http/3 support for Kaspersky Internet Security was marked as the answer
So my guess was 100% correct. Kaspersky was checking all the HTTPS traffic and converting http3 to http2.
I blocked these two URLs from my network.
ksn-url-geo.kaspersky-labs.com
ksn-verdict-geo.kaspersky-labs.com
And then now my browser can use the http3.
So the issue is with Kaspersky.