Blueprints with Input action events are dirtied and upon being opened

Opening a blueprint that has an input event in it cause the blueprint to become dirtied and require compiling.

Regression?: Yes
This did not occur in 4.16.3-3561208+++UE4+Release-4.16

Versions tested:
4.16.3-3561208+++UE4+Release-4.16 - Did not occur
4.17.0-3573198+++UE4+Release-4.17 - Occurred
4.18.0-3575318+++UE4+Main - Occurred

1. Create a new project
2. Add an input event in Project Settings > Input
3. Create a new actor blueprint
4. Add the previously created input event to the event graph
5. Compile/save the blueprint
6. Close and reopen the project
7. Open the blueprint
   Result: The blueprint is dirtied (requires saving) and requires compiling
   Expected: The blueprint is not dirtied and is compiled