Well, my stable has disappeared when I loaded my old save on 1.11.
Is there anything I can do besides rebuilding it ?

EDIT: My horse is still there btw.

Just curious, did you happen to build it near the cave? When I try to move the stable in my save I can't even put it back because of of the tiles is now invalid for structures.

It was adjacent to the house and I built it again in the same place no problem. I'm actually not so sure anymore that it was there in the first place. I might have stopped playing in the middle of 'moving' it.