Hi Supermicha, it’s not you, it’s the button. I tried a few things to get it to work like writing the text label to the button after the tween finished, but I either got the same result as you or weirder. Mostly weirder where the button would stretch way too far vertically to hold the button label text. I changed the font size to very very small and the vertical stretch didn’t happen. However there’s no way to change the font size with actions.
If I made the scale about 1.8 or larger the button would grow and then disappear to be replaced by a black rectangle.
It’s probably not a bug, but just something that is unfortunately not suitable at the moment for the buttons.