Function input Bool loses checked value when updating from 4.16 to 4.17

Licensee reported that when updating from 4.16.1 to 4.17.2 the value of a function input Boolean is being reset. It is checked as True in 4.16, but when switching to 4.17, it is no longer checked. (4.18 shows the same behavior as 4.17)

Incidentally, if the project is switched back to 4.16, the bool returns to the original checked state.

1. Open attached project and open TestActor Blueprint. Note that The input bool "Param" is checked on Test Event.
2. Exit and use "Switch Unreal Engine version" to change to 4.17
3. Re-open the project and TestActor blueprint.

Result: Input bool "Param" is no longer checked.
Expected: Input bool should be checked.

Note: If the project is switched back to 4.16, the bool is back to checked state

Fix UE-51650

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