It appears that when I attempt to use Diffusion with options and specify a heat column with a name other than the default (diffusion_input), I get json parse exceptions.
To replicate:
Execute Diffusion with no options to generate the default columns.
Rename input_column to misc_column
Execute Diffusion with options and specify the renamed column as your Heat Column.
It appears that when I attempt to use Diffusion with options and specify a heat column with a name other than the default (diffusion_input), I get json parse exceptions.
To replicate: