Problem with the set from the Dream Island: Madeira

Paid for, received the world. I only used the first world I created after the purchase. Recently, Dream Island: Madeira was updated and all the textures from my world disappeared. That is, instead of the textures that were in the set in my world, now the usual minecraft textures. WHY? I DON'T WANT to create a new world of this set. Because I built a lot of things in this world. PLEASE return the textures of the Dream Island: Madeira set to the worlds created before the update!!!!