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HTTP/3/QUIC supports migrating connections between two networks, such as if a user switches from WIFI to LTE. IPVS or any UDP load balancer won't handle this scenario properly since it doesn't introspect the QUIC header and load balance based on the QUIC connection ID. This QUIC connection ID allows for a stable connection when the device needs to switch networks. If operators have any sort load balancer (like IPVS) between the client and the point the HTTP/3 connection is terminated, they will need to ensure that it has proper support for QUIC. One example is Katran[1] which has support for this method of load balancing.

[1] https://github.com/facebookincubator/katran

Any other L4 OSS around with support for HTTP/3 except Katran?

I've tried to use it but it was pain :).

Not that I am aware of.

>nginx doesn't have it in the public stable version yet

It's near, roadmapped for 1.25:

https://trac.nginx.org/nginx/roadmap

Yeah. Should test it, would be interesting to see if DR is working with UDP balancing (via IPVS).