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this is unlikely to be related to OVS, given that tcpdump says the DHCPOFFER does not even get sent out by the tap8adb92d6-37 device. The problem is probably higher up in how dnsmasq is being used.

Are you using namespaces for DHCP or not? If not, its possible that your system could have overlapping routes for the prefix, causing that packet to be sent out an interface other than tap8adb92d6-37.