But they're none of those things. It is a bug or at least sub-optimal and immersion breaking. The notion that tiny Navarra thinks it is in its interests to help the threatening blob next door against a religious champion is silly.
First, you had just said in your former post that it is not a bug.
Now it is again.
Hmm...
Second, it has to be one of the things i mentioned, how else could they join a war ?
If it is indeed not, and they joined like coreligionists would for exactly religious reasons, then that sounds like a bug indeed,
assuming that Navarra is not ruled by a muslim. So what is the reason then and why ?
In the case of the myaphysites being tributaries you delivered the reason, it makes sense and similar happened historically.
Being suboptimal and immersion breaking for you should be irrelevant, if that's how it is in the game and to a degree in history
and is not obviously based on an error.
Maybe i was the only one who understood this mod as an optimisation mod first of all and not an overhaul, but i think Whizzer wold have
corrected me already. If i misunderstood something or look at it a bit too narrow, then i wouldn't mind at all being corrected.
If i misunderstood, then my disagrement with you would be gone, but as far as that is not the case it will stand.
For the assumption of a bug it could be helpful (at least for me), if you could either attach the save where it happens or a better
description on the situation and why in this example Navarra helps the Ummayads.
Then it would be easier to comprehend the situation in-game and your impression of what happens.