Error in accepted Appointment UI - is this a known bug?

When I receive an invite to a meeting, the Notice (properly) says “Attendance is Required for Rampisad Mukerjee”. But after I accept ir, the calendar appointment says “Attendance is Attendance is for Rampisad Mukerjee”.

I have out-of-the-box R8 mail design (so does the sender).

Is this a known bug?