Before the GNOME stack update, I had compiled and install the Budgie Pixel Saver applet from Github at https://github.com/ilgarmehmetali/budgie-pixel-saver-applet. However, once I updated, windows are no longer undecorated when maximized. The close, minimize, and maximize buttons on the applet still work and I am able to change its settings without issue. Can I do anything to fix it or is there an alternative for it?

    Good idea, I honestly don't know. I'll see if I can contact them!

    You'll likely just need to re-compile it as libraries changed.