I noticed this about a month ago, however, I thought it may have been just on the stunt coat. After viewing the film, I realized…. Yes, this IS how it actually is in the new film.
Not only is the coat fabric NOT the ebony raffia. The buttons are definitely different AND the buttons on the back of the coat are on the inside of the button hole trim… no longer on the outside.
I will be making a new system for ordering the Jack Sparrow frock coat soon. Now you will be able to order “coat 1-3” or “coat ost”.  The new buttons are on order and will be here soon.