Cant Switch Font in Variable Mode in other Project

I'm using Figma's Simple Design System (SDS). I added a new Mode to the Typography Primitives collection so I can switch to a different font.

When I tested it directly in the SDS project file itself, I can easily select the mode and change to a different font without any issues.

However, after I publish the SDS library and add it to another project file to use, I can no longer select or switch the mode to change the font.

Does anyone know why this is happening? Please help me out. Thank you!