One of the main enhancements added to mutter for the 3.26 cycle, at least according to the release notes, were the smooth transition animations for windows when switching between half-tiling, maximized and custom size window sizes (and between left-side and right-size half-tiling), but I found that those animations are actually being showed just for apps running on Xwayland in a Wayland session (or for all apps when running in a X.org session), while apps running on Wayland just have a simpler fade out / fade in animation between the two window states and the real transition animation isn't showed.
So, is this a known limitation (just temporary, I hope) of Wayland/mutter's Wayland backend or a real bug?
In the first case, maybe it'd be nice to document this limitation for apps running on Wayland, although it'd be strange that a new window manager feature is not available using the currently default display server.