Google translated article (Original hebrew article) .
I've first heard about this recall in Galatz radio station, during the way back to my hostel.

Im trying to guess what the defect is, assuming the lantern is like in the picture

I think it is either cracked glass that eventually breaks and drops in 2 parts, or trouble with the spring latch holding it. Either of them would be spotted right away by who installs the light in the 1st place (in the case of the spring, it is quite noticable when it does not travel freely and press the glass in place, but gets stuck on the rail halfway in), as long as the installer pays attention to what he is doing

Or "C is right": The design is sensitive to really following the proper installation procedure and some customers have installed it improperly and so had the problems. As IKEA model is "DIY install", such sensitivity could really be a problem...

By the way the recall is really world wide for all those models...

Is there any inforation on what really is the problem ?

On some of such fixture the lugs holding the glass have to be checked/adjusted to hold it level, each time the front glass is being removed, otherwise it tend to slip loose and so fall off. The thing is, if the glass lies on the lugs, it block them from being tightened.
But there are many fixtures with such design (the screw lugs are possible to make ornamental and rather tiny, so it looks quite well, while it still allows quite great tolerance for the glass cover size variation, so it is easy, so not expensive to make), sold by many makers. And I do not believe, they would not suffer from the same problem.

But I'm not 100% sure this is really the same design as the recalled fixtures, the one I have (suffering from the described problem) is already few years converted to LED's (4x 4W ACRiche of the 1'st generation) and so all the stickers are gone (I had to fit there an aluminum back plate to spread the heat)...

In the ones in the picture, iirc 2 lugs are spot welded to the base and the 3rd you can pull out on a spring. If the spring still press it in place when it is holding the glass (spring tension not released all the way), then it is good to go

In my home there are couple of the spring-less type. Here the upper metal tray extends outside of the glass, all 3 lugs can be turned in place (screw that goes through the tray) and out of the way to release the glass and put it back. They are approaching 20 years now, seen many lamp changes (and a base change, from R7s to E27 when i moved them from linear Halo's to CFLs), still never had them become loose

Here is the U.S. CPSC report.

https://www.cpsc.gov/en/Recalls/2016/IKEA-Recalls-Ceiling-Lamps/

Well there is the answer. The clowns made the lugs out of PLASTIC. Who could have guessed