2d bin packing using or-tools: AddNoOverlap2D and OnlyEnforceIf gives MODEL_INVALID

Question

I am playing with a 2d bin packing model. I tried this using:

for j in range(n):
  for i in range(j):
    model.Add(b[i] == b[j]).OnlyEnforceIf(b2[(i,j)])  # not