I tried the solution you gave me and everything remained the same.
The problem seemed my hierarchy. The sprites, textures and labels that were to deep in the hierarchy were not affected by the upgrade.
To solve the oversize, I made an script that moved them to an upper level on the hierarchy, turned them off and on and returned them to their original parent. It worked with both textures and sprites.
With labels, however is different. After reapplying the update (and before running my script), I noticed that the font size of every updated label was 16, some of them huge and others small. Those labels lost their aspect completely. Only a few cases were without problem.
It has something to do with the font atlas? Or is another issue?
Thanks in advance.