issues making custom content

ive used the sims 4 studio for a long while making custom paintings for the sims, but lately the paintings turn out completely see through. literally not there with a bugged out hitbox. ive not changed my methods since months months and months ago so i dont really know what im doing wrong.

i just click standalone recolor and then search up the painting i wanna recolour. i import all the files need and recolour the swatches, save it as a package and put it in my mod folder so basically everything according to the internet tutorials which used to work in the past.

did something change in making custom paintings in the last year?

i followed this tutorial succesfully atleast till a year ago