How does re_emergent work?

[Ocyalos]

In descr_strat.txt you can define the following attribute to your faction:

faction sparta, comfortable_caesar
re_emergent
denari 4577


settlement
{
	level village
	region Laconia
	year_founded 0
	population 684
	plan_set default_set
	faction_creator sparta
}


character	 Idomeneus, named character, leader, age 44, , x 138, y 46
traits GoodCommander 1, PoliticsSkill 2, greekgods 1
army
unit	greek general's guard cavalry early	exp 1 armour 0 weapon_lvl 0
unit	greek hoplite militia	exp 2 armour 0 weapon_lvl 0
unit	greek peltast	exp 0 armour 0 weapon_lvl 0
unit	greek hoplite militia	exp 1 armour 0 weapon_lvl 0
...

This should in theory make factions come back after they have been destroyed, if one of their native regions rebels. In my test case, the Region Laconia was defined to have sparta as the native faction:

Laconia
	legion: Legion_Sparta
	Sparta
	sparta
	greek_rebels
	244 13 24
	hides, slaves
	5
	1
	greekgods 100

I defeated the AI faction sparta and destroyed them. Then I let Sparta revolt against me - but unfortunately they became rebel faction - the faction Sparta did not re-emerge.

What am I doing wrong?

[Mr.IAmHere]

Isn't that native region rebellion faction random chance? Maybe you just need to trigger it multiple times and roll the die?