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So, looking at the HTTP3 wikipedia page I see this:

"HTTP/3 uses QUIC, a transport layer network protocol which uses user space congestion control over the User Datagram Protocol (UDP)."

Ok. Is it still a thing with internet core routers that in case of congestion issues they drop datagram packets because they're not guaranteed to be delivered anyway?

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Internet routers do not differentiate between TCP/UDP. They do drop IP packets when congestion occurs (regardless what's inside).

That's correct, with HTTP3 active you are extremely vulnerable to your packets being dropped and other sorts of transport issues. The browser will ideally fall back to a different protocol if it identifies that your connection/routes/etc can't handle QUIC.

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