Dunno, but I suspect there's a general problem with non line of sight fire optic guided missiles with infrared seekers.
All such projects seem to die.

An EuroSpike engineer claimed to me that the breaking fibre problem was long since solved with engineering trickery (a material applied to the surface fo the glass fibre itself), but I learned that some people opine that infrared seekers are poor for lock on after launch (= not a good missile sensor type for finding & identifying camouflaged targets).