I want to know why the destination value is recorded as "none" in the firewall log

hello everyone

I have one question and would like to hear from you.

There is one singularity that is logged in our Firewall Log.

Sometimes it matches the firewall policy, sometimes it is indicated as Allow due to insufficient app data, and the Action is allow / block various, but
The destination value is marked as “none” in the log.

Why is the Destination displayed as none?
Also, what would be the scenario packets where this could happen?

Best regards,