QUIC (HTTP/3) connection does not work when using SOCKS5 proxy

When using socks5 proxies, QUIC (HTTP/3) connections do not work, only HTTP2.
I check here https://quic.nginx.org/quic.html

Strange. QUIC is just an add-on over UDP, just like HTTP is over TCP.
And Socks5 supports TCP and UDP. In theory it should work.

This forum isn’t very active. Bugs should be reported in Bugzilla. https://bugzilla.mozilla.org

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