When VSM is enabled, animation is not culled and animation continues to play.
WhenVisibilityBasedAnimTickOption=OnlyTickPoseWhenRendered, animations outside the camera view are culled, but when VSM is enabled, LastRenderTime is will keep updating ("bRecentlyRendered=true"), so they will not be culled.
Animation is not culled and stats values are retained.
Animation is culled and stats shows smaller value.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-163467 in the post.