This message is completely normal. What this is saying is that during the time before we've identified your Symfony transaction, we can't yet send out the information to a downstream agent. This means that these HTTP exit calls will not correlate. If you would like these calls to have correlation, you can disable the PHP MVC transaction detection. In that case you'd have the BT discovered based on URL.
Please let us know if you have any further questions or concerns.
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