Seen things like that happening on new walls but strange that it happens on a well matured building. Would definately agree that it's cracked in the substrate and carried through rather than the stress of the tiles on their own.
 
With all the dry weather the ground can be so dry it shrinks back and could have caused some slight movement in the building, check out the exterior and see if theres any cracking by the windows....
 
Movement IMO....on the plastering side of it if a crack was present or a possible chance it may happen I would cut out either side of the crack and fix eml over it and then plaster over that flush to existing plaster....
 

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