Invisible units

[OmegaDestroyer]

Just ran into a fun bug. I declared war on Catherin's Egypt. Her Medjay turned invisible during initial contact and proceeded to absolutely decimate my forces. At first, I couldn't see anything, other than the health dropping of my units. When one was destroyed, I'd get a notification that a Spearman destroyed my unit. I didn't see any Spearman, so I was even more confused.

I'm used to the AI cheating, but this was a bit much.