Another Great Breackthrough in FBX Ugliness: properties seem to have complete different signature when they are animatable or not!

E.g.: for double properties, non-animatable will be ("double", "Number", ""), while animatable ones will be ("Number", "", "A"). Yep, looks like a good old flag is not enough...

Btw, this still does not fix animation issue (since Lcl Translation & co are not affected by this, they seem to always be animatable...).