Mouse Hover Trigger on Layers Problem

I saw another post similar to this, but no answer for it.  Here's what I'm trying to do:

- I have 3 layers(base layer, then duplicated the base layer to get layers 1 and 2)

- Click on a shape trigger to get to Layer 1.  

- On Layer 2 I have a transparent shape with a mouse over trigger to get to Layer 2.

But this is what happens:

- When I hover the mouse over the transparent shape on Layer 1 it shows the Base Layer instead of Layer 2.

- When I change the shape trigger from Hover to Click, it works.

I don't get what's going on.

I know there are other work arounds to achieve the effect I want, but why is this not working?  Is not possible to have Mouse Over Triggers on layers other than the Base Layer?  That seems odd.

Thanks

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