105
The Z Fold series is really a Samsung experiment and it was introduced quite a bit with the Z Fold 3 that the internal camera is hidden under the display. But with the Z Flip series, more secure cards apply.
Now information has surfaced that Samsung can hold out and test the Z Flip 4 with the selfie camera hidden under the display. There is currently no additional technology, but with the current realization, it should have been significantly improved.