Tughlaq’s Elephants have access to an ability called Trample which appears as a cloud of dust around the unit. The problem is a very simple one that must’ve slipped through the quality testing. Basically, the effect itself is called onto the Elephant from another position, usually offscreen. What this means is that whenever you cast Trample, you can see for a split second a ball fly towards the unit from off screen in whichever XYZ direction rather than simply spawning on top of the Elephant.
From my experiments, it seems to spawn somewhere off to the northeastern part of the map. Not specifically north and not specifically east, so it looks as though the effect is spawning off screen in the X axis.
I’m hoping this gets fixed soon because it is very distracting when playing Tughlaq.
Bonus bug: Mongol traction trebuchet’s shot is not synced with its animation, and it has an obscene collision box when selecting it (likely the rope which hides beneath the floor).