I don't see the bug there.
As for bugs, is anyone else having a slowdown after awhile of playing this? The game gets much slower the longer it goes. Turns are taking about 15 seconds, and it's rather longer than it should be.
On small (erebus_continents) maps I never encountered that, until I moved to prince difficulty level. then it was really slow. I went to world builder and found MANY stacks of 50+ units. I deleted them and it wasn't slow anymore.
Now I edited the Civ4UnitClassInfos.xml to give every unit that has no national limit, a new national limit of 6 units. warriors get 8, scouts get 3, and adepts get 8.
this helps. And the good thing is, that the AI (on monarch) is still able to build huge stacks, this time with skeletons, catapults, axeman, archers, etc. so it is not crippled, especially because me too has the limit of 6. heroes are much more of an impact, also the civilization heroes are now good for something.
furthermore the AI won't be crippled regarding it's economy. for me that's a good thing, because it focusses more on the units you have and it gives you a reason, to build warriors even late in the game. another good thing is the need to move the troops to the front lines. no more 50 axeman in the capital.
the Sheaeim really were nasty. and the D'Tesh killed my whole army with Assasins (first time I've ever built Lugus Gift).
btw. are the Mercurians broken only in FF+ or also in FF? If Basium arrives, there is no problem, but with the other Leaders they die instantly. I wasn't able to unmod them.