logs with the destination 255.255.255.255 are for an invalid DNS entry that was requested. If you look at the request, you see the domain was 1190426, which (without validating) does not resolve.
To prevent this in your access logs, put a rule that does a Stop Rule Set if the URL.Destination.IP matches 255.255.255.255. I've attached what we have implemented in our Log Handler to prevent sending of those to our access logs.
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