AnimBP Bug: Print string triggered though not referenced

Newly created animation blueprints will fire themselves during any form of PIE if they have been newly created during that session and even if no assets in the scene reference them at all. Restarting the editor alleviates the problem.

1) Create a new animbp off any skeletal mesh
2) Add an empty state machine with an empty state
3) In the event graph, tie in a print string
4) PIE (will print on tick)
5) Restart the editor
6) PIE (problem solved, no output from print)