I noticed the pet seed had mentioned getting a Pot infused by the Mists or whatever the in game text is, and without realizing it was a bug yet let it lead me on into the Fractals of the Mists portal and purchased the mists stone.
I had created the back piece prior to the patch and have a story similar to most others here. I’ve finished the story for the newest part and have completed progress on all of the construction pieces excluding the newest food for the plant.