isotropic no longer works on block variants as of 1.20.0

 As of 1.20.0 None of my block variants respond to 

{
    "isotropic": true
}

false / true. They've worked for 3 years until the last update 1.20.0. Tested the morning before the update and worked.  

Sand, Grass, Soul Sand, and countless others stopped being correctly allied and now randomly rotate breaking the seamless textures on all faces.