When list=allusers is used with auactiveusers, a property 'recenteditcount' is returned in the result. In bug 67301 it was pointed out that this property is including various other logged actions, and so should really be named something like "recentactions".
Gerrit change 130093, merged today, adds the "recentactions" result property. "recenteditcount" is also returned for backwards compatability, but will be removed at some point during the MediaWiki 1.25 development cycle.
Any clients using this property should be updated to use the new property name. The new property will be available on WMF wikis with 1.24wmf12, see https://www.mediawiki.org/wiki/MediaWiki_1.24/Roadmap
for the schedule.
Brad Jorsch (Anomie)