bug in VSCODE highlighting - - or in internal library?

i've noticed a strange bug in the 'problem highlighting' of VSCODE and i wasn't sure if this is a problem with the internal library definitions of iris, or with the plug-in itself.

The first line is the correct macro call, but the second one is the one throwing the error. (preprocess vs prepOrocess)

How is this syntax checker's list of strings compiled?