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dbf475f066
I just found that we don't have a test case covers the scenario of DNS-SD when there are multiple BRs. Specially, one of the BRs starts with no mDNS cache. There was a time that our mDNS publisher answered the queries correctly, even when there was a bug in mDNS publisher that it cancelled resolving/browsing too early (was fixed in https://github.com/openthread/ot-br-posix/pull/1120). That bug was hidden because mDNS cache already contained the needed information.