Since a recent Windows update (I am not 100% sure which one) all of my ModernUI apps are showing up on all taskbars.

If I have a Modern UI App open on my center monitor, it only shows on the center (per my settings, all taskbars show relevant windows).

If I move said app to a side monitor it does appear on the Display Fusion taskbar but it also stays on the taskbar of the center monitor.

Some apps (Clocks & Alarms in particular) also appear without an icon on the DisplayFusion taskbars.

EDIT: Nevermind, see this has popped up in the known issues list.