Hello, I would not doubt that I could replicate this bug, but I was playing on Normal speed and no real special parameters aside 4 Continents.  Unique factions was on and I was obviously playing the Morgawr.  Around turn 140, I noticed that moving my Vore units left a small pink placeholder color over the sea from where the unit originally was and trailed after it.  I'm not sure what caused this as Leviathan and other sea units seemed to be working just fine.  I did combine some Mastermind armies into them and transfer them over to land shortly after.  I noticed this only affected two of my Vore armies (which both had two Vore each).  Also, towards the end of the game when I was causing mass Dissent, the Cat's Paw armies under my control were being attacked by my Forgotten ally who I was on good terms with.  I am unsure if these appear to him as neutrals as Privateers would be; if so, then it would make sense as they are not truly my own units, but I am sharing Vision with him which is an odd choice of his.

EDIT: Title mistakenly says Rovers instead of Vores