Doesn’t read new attributes

I was wondering if there’s a trick to making CTX feed generator read the new attributes. So it worked well until we needed to add a new attribute, global attribute available on all products. We went through the hassle of completing all attributes needed, only to discover that CTX doesn’t read the newly defined attribute in the “Attribute” -> Select which one list.
I cleared status -> cache, I even deactivated / reactivated the plugin, regenerated product attribute lookup tables, cleared transients, clear apcu / opcache.. no avail, CTX simply won’t read the newly added attributes, we can’t map that one to any field.
What’s the trick?

Any help would be greatly appreciated.