According to the official TfL webpage, the change is not mentioned.
tfl.gov.uk
Bus changes
Permanent changes to TfL bus routes including new routes and changes to first and last stops.
Changes to buses from Saturday 15 July
The following timetable changes will take place from Saturday 15 July.
The temporary timetable on route 31 will be removed with the frequency of the service restored to run every 10 at all times on all days of the week.
The temporary timetable on route 39 will be removed with the frequency of the service restored to run every 8 minutes during the daytime on Monday to Saturdays and every 12 minutes during the evening, every 15 minutes after 2330, and all day on Sundays.
Route 86 will have a new timetable on all days of the week with minor changes to times.
The temporary timetable on route 93 will be removed with the frequency of the service restored to run every 6-7 minutes during the daytime on Monday to Saturdays and every 10 minutes during the evening and all day on Sundays. Buses continue to run every 30 minutes on all nights of the week.
A temporary timetable will be introduced on route 422 which will widen the frequency of the service to a bus every 11-12 minutes during the daytime on Monday to Saturdays and every 13-14 minutes during the evenings and all day on Sundays. This temporary change is to give buses more time to pass through the East Greenwich area during gas main works on Blackwall Lane.
The temporary timetable on route 493 will be removed with the frequency of the service restored to run every 12 minutes during the daytime on Monday to Saturdays and every 20 minutes during the evening and all day on Sundays.
Route N86 will have a new timetable on all nights of the week with minor changes to times.