Flipbox button text visible through backside

Hello. I would be really grateful if someone could help me with this as I cannot find a solution.

When I add a button on the backside of the flip box it is visible through the front side, even though backside hidden is enabled under CSS transformations and transitions.

When I toggle backside visibility on the button is hidden but the button text still shows reversed through the front side.

As shown in the pics the button text remains visible through the backside. I have also tried manually applying backside hidden through custom CSS class but the result is the same.

This only happens with buttons. Paragraphs and heading are hidden by default by the backside container wrapper when added.

Any advice would be very much appreciated. Thanks