French : x or ks ?

Hello,

I got used to writing the x (=ks) sound using a modified s in French DJS. Only today I came across the word désaxé, which is surprisingly written with a K followed by an S, instead of the usual modified S that is to be found in fixé, taxé, détaxé, etc. So why the exception for axe and désaxé, which contain the exact same syllable as in taxe and détaxé ?

Thank you.


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