When using IfMax with a decorated layout, the decorations appear on other workspaces, even over other windows, if the other workspace uses a different layout, and the decorations don't disappear on a given workspace if the layout is changed by IfMax.

This basic LayoutHook exhibits the bug:

myLayoutHook = IfMax 1 Full $ noFrillsDeco shrinkText def $ emptyBSP

This seems to be specifically related to IfMax, since using ToggleLayouts with the same two layouts doesn't display this behavior.