The Ease function's Blend Exp reverts to its default value after closing/reopening the editor

The Ease function's Blend Exp reverts to its default value after closing/reopening the editor.

Reproduced in 4.6.1 binary and in Main (CL-2408355).

1. Open any project
2. Open any Blueprint
3. Create an Ease node
4. Switch the Function input to Ease In Out
5. Create two Float variables
6. Plug the Float variables into A and B
7. Change the Blend Exp to 5.0
8. Compile/Save
9. Quit the Editor
10. Reopen the project

Result:
The Blend Exp input in the Ease function has reverted to its default value of 2.0. If you plugged a variable node into the input, it will be disconnected.

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