I have a borderless NSWindow with transparent background floating at Dock level and with collectionBehavior set to NSWindowCollectionBehaviorCanJoinAllSpaces.
To render its background I was using an NSVisualEffectView, but, with the introduction of Liquid Glass, I decided to replace it with a NSGlassEffectView on Tahoe.
On macOS 26.0 and 26.1 all works fine: my window's background is correctly rendered and updated.
On macOS 26.2 this is not so: the background seems cached and doesn't update if I move my window or if I drag some other window underneath it.
My window's movable property is set to NO (and I need this to be so): dragging is implemented by handling mouseDown, mouseDragged, and mouseUp events.
Just to experiment, I tried setting movable and movableByWindowBackground both to YES. In this case, the NSGlassEffectView is correctly updated if I move the window itself, but doesn't change if I move other windows underneath it.
Has anybody experienced a similar problem on maOS 26.2? If so, is there a way to solve it?
Thanks, Marco