All my Parenthetical Elements in Script Mode turns to General Text when converting a file from Scrivener 2 to Scrivener 3

I have been using Scrivener 3 for some weeks; everythings seems to work great EXCEPT FOR this: everytime I convert my old Scrivener 2 files to Scrivener 3, all the paragraphs formatted with Parenthetical Element in Script Mode turns to General Text. I have to turn it back manually each one, wich means a lot of time spared in an operation wich is suppossed to be done automathically! Does anyone know if there is a way to fix this issue?