For some time, the AI will ignore the "Completion Radius" Settings, which located in the waypoint options. This does not have any effect on AI, while it affects the player! I remember very well those times when it worked well for both (human player and AI). The problem occurred after one of the updates.
Repro mission for joined AI-group here - https://yadi.sk/d/m3xtBifD3M3eKG
At this example, the "Completion Radius" of joined allied group has 1000 m, but waypoint not wil completed only for AI-units. Namely, the BLUFOR AI-squad leader will join only, when reached final point - "JOIN". Put yourself instead of the AI-commander of joined group and this will work immediately, within a 1000 m
Repro mission for moving AI-group here:
https://yadi.sk/d/VPphaavg3Nqnjv
The "Completion Radius" of moving AI-group has 100 m (first waypoint), but it again not will work only for AI-units. Namely, the CSAT AI-squad leader will switch to second waypoint, only until it completes its first point in fact. Turn on the game settings "Show waypoints" and put yourself instead of the CSAT AI-commander and this will work immediately, within a 100 m!
Today, the Rules of "Completion Radius" do not work for everyone alike (for human player and for ai).
BIS Please correct this issue, as this creates serious problems in missions