It seems like Projucer decide to truncate spaces even if they’re explicit.
Let’s say I want my PlugIn Code to be "ABC ".
I’m not aware of limits (and saw at least one product that does that across AU / VST / VST3 / RTAS).
If you’ll save "ABC " it will be save properly but the space will be truncated from the AppConfig.h
Even trying to trick it with " " won’t work.