Can't destroy AO when Inactivated far from window

I noticed that an AO with a disappearing animation may cause problems when using the "Inactivate far from window" option. The destroy command isn't completed if the disappearing anim is interrupted because the AO is too far from window. Is this a bug or is it really supposed to halt the destruction until the AO is in range again?

Here's very simple demo which demonstrates the effect.