I have submitted the issue to Epic.
As I said the engine doesn’t really crash, it just won’t package with mobile virtual textures support enabled.
I also tried to modify the engine source code (4.27) and I managed to package my apk, but the textures are not present when I launch my apk on my Oculus Quest 2.
However I think that I am close to some kind of workaround.
It seems that UE4 (the VirtualTextureDataBuilder to be more specific) doesn’t like virtual textures and misinterprets the Pixel Format of the textures… (is this meant by Epic or is this an oversight?)
Anyway, if I make any progress I’ll keep posting here
Have a good day