Use of useBeacon is showing cancelled network calls

Hello All,

Context:

I have taken on a project where custom codes were used liberally to do the implementation. It was discovered that the cancelled beacon were alleviated when a 3 second delay was added to the rule. This was a recommendation from Adobe Support at the time. However, now we have a 3s delay when users click our links and we still the cancelled beacons on this rule. 

Now our goal is to address the root cause and the method we are looking to employ is the useBeacon method. The issue is - even with useBeacon method being set to "true" on the Adobe Extension, we are seeing the beacons getting cancelled during testing. 

I would like to know ways I can troubleshoot to see why the useBeacon method is failing and what I can do to avoid the cancelled beacons.