In the recent bug report here, it was pointed out that writing “Use authorial modesty.” outside of an extension leads to Inform 6 errors. The consensus in the notes to the issue seems to be that this use option should do nothing in this context, but WI 27.6 says otherwise:
Am I misreading this somehow? If not, I can’t seem to reopen the issue on Mantis since I didn’t submit it originally, but maybe a developer can.