All my worlds are replaced with the same seed when i save them!!!

When i played for the first time in the latest patch, it was fine...
But i created new worlds that are replaced by the same seed every time i save them... That's really annoying... I checked everything:
Storage,options,tried to find updates... And everything is fine!
I saw this bug on the website but... Mine is a bit different .
I tried on a old "junk" world ,and it does the same!
Now i'm forced to play with my friends (who,apparently,doesn't have the bug),or in a mini-game!Please, try to fix it so i can enjoy playing MCCE again...