How to create buttons Hover State in XD?

I exported some button graphics from an Illustrator drawing of a UI. These buttons use a rounded bevel. There are six transparent PNGs to go on top of them with differnt icons. I put these together in XD to make six button components. They look like this:

Now all I want to do is set the all of them to 60% transparency, and go to 100% when I hover over one, just so we can see something interactive happening. However, it seems we can't set the transparency for just the hover state. When I change transparency, it's changing the default state also.

I have researched this problem, and followed the advice of selecting the elements inside the component and not the component itself, to no avail. It's a pity, because so far I have not had to think using this app...and it allowed me to get quite far quite quickly. All that is progress is now undone by being stuck for hours on what appears to be a poor implementation of something that should be simple.

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