Well, for me it works i the 1.3 version.
Deleting the enchantment via "Govern" allows to reassign it to another unit.
Nevertheless, it makes most sense on the sovereign anyways (playing on insane), so no need to be sad 
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PS: the graphic bug from Fallen Enchantress (borderlines and movement paths DISAPPEAR due to much loading and saving) is STILL present. Wonder why this is not fixed? It has been over a year now or even more 
