I did Edit | Find | Project Replace… of a word that occurred twice in one document and was also the only word in my keyword list for that document. I did not change any of the default checkboxes in the Project Replace… panel. The change was just a spelling change of one word.
After the replace, the two words in my document were changed, but the keyword was not. I expected the keyword to change as well.
I’m using the NaNoWriMo template in the NaNo trial version of Scrivener, on a new MacBook Pro.