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The problem you’re having seems to be tied to how Google Analytics 4 processes events and parameters coming through its Measurement Protocol API. Apparently, custom parameters specified in these events are not instantly accessible for custom event creation, hence your event with the “user_plan” equals “testing_plan” condition isn’t triggering. In contrast, when events are sent via gtag, the parameters are recognized immediately, explaining why your custom event works in this scenario. This is not explicitly stated in the documentation, which might be why you are facing confusion. Until Google addresses this, a workaround could be to keep using gtag for these events if possible.
