Problems with windows that have header bars/custom decorations

So if a window with a header bar or custom decorations is maximized when it is opened (i. e. a web browser that saves the state of the window or the GNOME software center), some dummy window decorations are loaded.

I happened to see that in Mate 1.22 this seems to have been fixed. Can I do anything to fix it in Mate 1.20?

Same here bro, It happens when when I grab maximized windows which use gtk3 border.