A guest whose connection dropped during a host transfer could not get back in. The relay broadcasts hostChanged only to connected peers, and the guest's reconnect rejected the re-admission because the host differed from the one it had pinned, then left the room.
The pin predates transfers. The relay is the authority on host identity and verifies the reconnect token, so a valid re-admission naming a different host can only be a transfer: the client now adopts it and surfaces it through the same onHostChanged path.
On the relay, hostChanged is enqueued while the room lock is still held. Two transfers in quick succession run on different connections, and enqueueing after unlock could deliver the older authority change after the newer one; enqueueFrame never blocks, so holding the lock across it is safe.
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