Multicast DNS to interface address instead of 224.0.0.251

[A Former User]

Hi all,

I would appreciate if one could help me with the following question.
I have Multicast DNS enabled through 'udpbroadcastrelay'. Functionality is working fine.
On the relevant interfaces, I have established allow rules (incl. IP-options) that allows UDP traffic from the interface network (IOT in my case) towards 224.0.0.251:5353 as destination.

Last weekend, I dug into logs, and found out that there's quite some devices that initiate mDNS traffic, but instead of the multicast address as destination, they point towards the interface address of that interface. Like so:

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I am rejecting the traffic, so I guess this is not a big deal, knowing it's working, but I wonder why this traffic gets initiated in the first place. Has anyone else encountered this before? Should I put in place a pass rule to allow this type of traffic?