Hey Fares,
Thank yo so much for the warm welcome!
The solution was: GraphQL aliases is not supported in preview mode, I had to modify it all.
The solution was provided by: Angelo Ashmore
https://github.com/prismicio/prismic-gatsby/issues/434#issuecomment-905775725
If somebody with problems I recommend you to check out this link with some limitations which Prismic Preview's have:
Furthermore, an excellent list with common problems and solutions:
https://community.prismic.io/t/troubleshooting-previews/5449
Big hug,
Luis