Logic Pro X 10.3.2 Custom Icons?

Okay so I recently updated my Logic Pro X to the new version (10.3.2) after a fresh install of HighSierra and I was trying to set up all the guitar tones I previously had because I didn't back them up, when I noticed that the custom track icons option was gone. Used to be below "Other".

Surely this must be an error, I think it was a new feature in the last version or something. I know having custom icons wasn't a thing in the past.
Any way to get it back? (I don't mind messing with Logic's package contents, in fact I tried but I can't find where it stores the icon files.)