Error on Attempting to Save Map Containing Actor Sequence Component

colored text+Link to screencast of repro steps: +
[Link Removed]

-May take some clicking around even between windows
-Will not save after this
-Does not affect 4.16

1. Create a new Unreal 4.17.2 project, using the C++ Basic Code template, Desktop / Console, Maximum Quality, and With Starter Content
2. Under the plugins menu, choose the "Actor Sequence Editor (Experimental)" plugin, enable it, and restart the engine as prompted
3. Save a new Map, called TestMap
4. Create a new Actor Blueprint, SequenceTester_BP
5. Place an instance of SequenceTester_BP into the map
6. Open the Blueprint Editor for SequenceTester_BP
7. Add an Actor Sequence Component to the blueprint
8. Add a Static Mesh Component to the blueprint and set it's Static Mesh to 1M_Cube
9. Select the Actor Sequence Component, open the Sequence Editor, and add a Transform track for the Static Mesh
10. Add a Location Key (0,0,0) at t = 0 and (100,100,100) at t = 1
11. Play the animation in the Blueprint Editor
12. Move the instance of the blueprint in the map a few units along the Y-Axis (or do any other action to mark the scene dirty)
13. Attempt to save your map – you should now see the error message

Expected: The files will save without errors
Results: The files will not save and there will be an error message

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