This is only a small thing, but to me details matter. Whilst taking some older CN designs out for runs I noticed the little green first aid badge was missing, and so went into LD to check if it was just a glitch I could fix by messing with projection etc. Nope, no amount of fiddling could fix it, the item has disappeared from the 'Sign' list altogether. But I did notice a few weird things popping up in the editor over time, like random letters in an unknown font for instance. So, this is my suggestion, place the first aid decal back in the game as that, along with the fire extinguisher sign, is still integral to the character of a CN livery. Makes it a little more authentic, plus it's annoying that existing designs I've made have pieces missing without me deleting them.
Apparently the random weird odd font letters are awards for some mastery challenges or something. It was mentioned in a thread I posted where I mentioned the same thing.