CK II - Enemy Allies

[Whaleyland]

One line summary of your issue
Enemy Allies

Game Version
2.8.1.1

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
A Holy War was declared against Aquitaine in about 920 (769 start). I was playing as the Skelleros of Calabria, a Byzantine vassal. I decided to join the Holy War. I was technically at war with some random other country (via the Byzantine emperor). I sent troops to France to fight in the crusade. Since they were a small force, I attached them to an Allied army (blue). That army merged with yet another Allied army (blue) and my troops were immediately killed. Apparently, my enemy from the other war (which I was only indirectly fighting) was an Ally in the crusade and, when my troops met his, they defeated me.

Enemy troops need to be Red always. They should NEVER be blue, since that shows that you are allies with them. I didn't lose much in this instance, but I certainly could have.

Steps to reproduce the issue.
Go on Crusade when your lord is at war with somebody. Your lord's enemy also needs to join the Crusade. The enemy army will appear blue (Allied) even though it is still your enemy.

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[Darrman]

I've also had a similar issue. 2.8.1.1, no DLC/mods.

Some random cousin wanted to claim Poland, which I was in control of, so he got the king of Sicily to declare war on me. Sicily then got some other duke involved in the war. Meanwhile, a defensive pact activated against Byzantium and I moved out some troops to prepare to fight, of which the enemy duke was also part of. A HRE/duke guy army were passing through at the time, and as duke guy was my enemy in the Sicily claim war, he attacked me, despite being coloured blue. As the HRE had no issue with me at that moment, they continued marching.