Tick fires in PlayerController BP in Editor

If a blueprint has any functionality on tick, the tick event will fire when a blueprint is restored within the editor after closing and reopening a project.

Regression (no) issue (does) occur in 4.12.5

1. Open Editor (any project)
2. Create new blueprint (player controller)
3. In Player Controller Event Graph> Connect a Print String node to Event Tick
4. Compile, Save
5. Close and Re-open the Blueprint
6. Look at Output Log

Results

Log is spammed by print string on tick after reopening

Expected

No log spam, blueprint editor window is opened