Ubiquiti WiFiman app overloads Pi-hole, generates too many PTR DNS queries

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Expected Behaviour:

Using WiFiman iOS app to perform speedtests or view connected devices does not impact my Pi-hole environment in any detrimental way.

Actual Behaviour:

Using Ubiquiti's WiFiman iOS app to run a speedtest or view connected network devices generates hundreds of concurrent PTR requests to my main Pi-hole system (Raspberry Pi) and my backup Pi-hole system running in Docker on Synology. I'm a relative Pi-hole and networking noob, sorry.

Both systems will usually throw out the following error code:
Warning in dnsmasq core: Maximum number of concurrent DNS queries reached (max: 150). But in some cases, Pi-hole will just rate limit queries, and not produce the dnsmasq error.

I have conditional forwarding disabled.

When I look at the query logs around the time of these errors, I see hundreds of PTR queries coming from my gateway (eero router) to various IPs in my local domain (for example, 244.4.168.192.in-addr.arpa).

Debug Token:

https://tricorder.pi-hole.net/4VvWgUeG/

Any help would be greatly appreciated! Thanks.

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