Matinee controlling a camera blueprint variable problem

Development Programming & Scripting Blueprint
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1

I have a math formula controlling the FOV of a camera based on a variable in a Blueprint based on Camera Actor.
I did this all in construct script and exposed the variable to matinee.
When I slide around the value in the editor, the FOV did change based on my Variable, great.

BUT, The problem is when I tried to animate the Variable through Matinee.
It doesn’t want to update the FOV at all. The slider value did change but didn’t change the FOV at all.

I’ve tried adding the same formula into the Eventgraph with Event tick to run the calculation, but it won’t work on Blueprint with Camera as it’s base actor.

I’ve tried to create another blueprint based on Actor and have camera as the component, and it still won’t work.
I’ve also tried adding event tick on the event graph to run the calculation, didn’t work either.
Am I missing anything here to annimate a BP variable through blueprint?
Any idea how to solve this problem?

Thanks in advance.

2

Oh my God, I just found out that any variable animated through matinee can’t be seen while scrubbing the timeline and can only be seen in PIE/Simulate. This makes it very difficult to use camera blueprint in matinee.
Not to mentioned that if the parent class of the BP is camera, I can’t use the Event tick in the event graph.

Is this something going to be fixed anytime in the future or 4.2?
Thanks in advance.