update reinstalling entire game

So I start up FS, the update begins, and I notice its actually reinstalling the whole 102gib for the game.

This cant be right, anyone else having this?

Well, I started the update and it was about 15.8gib.
But after about 11gib the updat hung. I closed the simulator and restarted and decided first to check the integrity. That went quick.
And then … I restarted the game and yes now it updates the whole game for the full 110,83gib, which takes a very long time.
It is busy right now, so I hope it is worth’while’.

I just checked the integrity and its installing the whole thing again.