Hi there,
for some of our setups I can see in the network monitor, that the first request is cancelled, followed by another one that is ok.
Is there any way to prevent this from happening?
What is the reason?
In this example, we use Consent Mode Advanced, so GTM and GA4 loads in any case, and we use the WP Plugin for custom loader deployment.
In sGTM preview, everything seems to be ok though. 
This means that the request did not receive a response because connection was closed.
This is usually normal for GA4 and most often occurs on requests, for example, on a click that leads to a page reload or page change.
In many cases, the event may actually be successfully sent and received by the server, but the response from the server simply does not arrive to browser before the connection is closed.
In the logs, you will see such requests with status 499.
