Interactive PDF - Buttons are not working if video is embedded behind them

Hi everyone,

I have a little problem with an Interactive PDF after exporting it.

The page is set up like this:

In the background is a video as mp4. Before it are a couple of buttons. Some of them navigate the video (play/pause) and some of them should jump  to the next page or the index.

At the beginning, all buttons are working great, but as soon as I started to play the video, they are not working anymore. If I click on the index button, the index page is shown for a milli second but then it jumps directly back to the video page.

The interesting thing is, that if one of the buttons covers the video only for half, the overlaying half is not working, but the other half is.

So my conclusion is, that it has to do with the video. Has anyone an idea how to fix it or is there any known workaround?

Kind regards,

Anna