<p>Not really -- during the execution of the route block, the x/avp lists from tm are set in the core, so the new x/avps are stored directly in the transaction. This is used for failure_route as well and any issue should have been exposed for long time. Unless it was the case of creating a faked env inside a faked env that should be fixed by my last commit.</p>
<p>I looked at the kazoo code and I noticed that <code>kz_amqp_consumer_fire_event()</code> is using fake sip messages to execute event routes. Are those event routes creating xavps?</p>

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