Bear in mind, not all airports or even runways have an ILS system
The ILS consits of two parts, the Glide Slope and the Localizer.
The localizer is the part that ensures you center on the runway.
Some runways have just a localizer, others are strictly visual.
That may account for not having the diamonds visible.
At LFMN, runways 4L & 4R are both ILS, but the reciprocal runways 22R &L are visual.
Visual approaches can be done with an RNav approach, but the airplane must be equipped with the avionics able to do that. (both the stock 787 and A320 I believe can do RNav)
If you were trying to approach one of the 22 runways, the AP would not be able to do so unless the proper RNav approach has been selected in the Boeing FMS (MCDU in the Airbus).
Having said all that, and I hope it makes some sense, there is also this “issue”