Has the location that developer mode theme files are stored changed in v12?

'fd' is for Factory Default themes, 'f' for themes that are not factory default.  If the theme you are editing is not a factory default theme it would be stored in the 'f' folder.

'fd' is for Factory Default themes, 'f' for themes that are not factory default.  If the theme you are editing is not a factory default theme it would be stored in the 'f' folder.