When using Blueprint Update Camera, New Camera FOV is taken into effect even if Return Value is false

In a Player Camera Manager Blueprint, when overriding the function BlueprintUpdateCamera, the New Camera FOV value takes effect regardless of whether Return Value is True or False. The New Camera Location and New Camera Rotation values only apply when Return Value is True.

Found in: 4.18 3709383
Reproduced in: 4.17.2 3658906, 4.19 Main CL 3724570

1. Create a PlayerCameraManager Blueprint
2. Create a PlayerController Blueprint
3. Change the Player Camera Manager in your PlayerController Blueprint to the PlayerCameraManager that you created in Step 1
4. Go into the PlayerCameraManager Blueprint
5. Override BlueprintUpdateCamera function
6. Put 120 into the FOV field and make changes to the Location and Rotation fields.
7. Keep Return Value unchecked (False)
8. Hit Play. Notice that the FOV value took effect, rotation and location do not.

Expected Result: If Return Value is False, none of the values in the return node take effect.
Actual Result: FOV takes effect regardless of whether Return Value is True or False.