Yes, mostly the following scenario:
AI 1 is friendly towards AI 2 and Player
AI 2 is friendly towards AI 1
When the player attacks AI 1 (as AI 1 is friendly towards the player but the player is hostile towards the AIs), AI 1 will be hostile
When the player attacks AI 2, AI 1 will be hostile towards the player.
When AI 2 attacks the player, nothing will change.
Using catapults also didn't change anything in the original game (thus considered as a bug).
As AI is friendly towards the player but the player is still hostile towards the AI, this is named one sided alliance which is
currently not working in RttR.
Hope that helps :)