If you click on the name of any friend in the right sidebar, a series of requests against the "friends" endpoint are triggered to load all friends. This happens regardless of when the last full refresh occurred, and it seems to be possible to trigger multiple paginated reloads of the friends data to happen in parallel (see screenshot showing multiple interleaved loads of the full friends list).

While this bug is asymptomatic it likely results in additional unnecessary server load; at a minimum, multiple paginated loads in parallel should be prevented.