Can't set animation center for objects

When editing the objects in a scene, for some reason the "set animation center" button is greyed out. Why is this? Can scene objects not have animation centers like characters?

Regular animations & object image sprite positions are based on the top left pixel of the image/animation canvas.

The reason you set an animation center in mouse cursors & characters is because that position determines where the characters will stand in a scene & which pixel of a mouse cursor will be used to detect objects, character, items, & buttons, etc underneath the cursor.