Describe the bug
Whenever I move a button with font styles applied (bold, italic, etc.) they are forgotten once the button is moved, reverting fonts such as "Fira Sans Bold" or "Fira Sans Italic" to simply "Fira Sans." Styles are also forgotten if StreamController is closed and reopened.

To Reproduce
Steps to reproduce the behavior:

1. Change a button's label's font to use a style, such as bold or italic.
2. Click and drag the button to another location on the deck.
3. Font styling is gone.

OR:

1. Change a button's label's font to use a style, such as bold or italic.
2. Close and reopen StreamController.
3. Font styling is gone.

Expected behavior
Fonts should remain bold/italic when moving them around the deck and should be saved between sessions.

I have StreamController installed via Flathub. I'm on KDE Plasma 6.5.3 using KWin under Wayland on Arch Linux (6.17.9-zen1-1-zen.)