Can you try the builds from my latest PR?

Doesn't work :-(

The SDP exchange works fine, the SDP looks correct (with just host
candidates from the client, but a full set of candidates from the server).
The client is sending a UDP/IPv6 flow to the server, the packets reach the
server, but the server-side OnTrack callback never triggers.

The source/destination addresses do seem to correspond to a pair of host
candidates.

FWIW, my code works fine against https://web.whip.eyevinn.technology/

-- Juliusz
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