Seems that when you kill a construct or zombie with a thrown weapon, they die and instantly vanish along with your thrown weapon.

I killed Sepharus's dirt construct with my throwing spear and when it died it vanished along with my spear, and I couldn't INVOKE to get it back. It said my link was severed and that's the last time I've seen my spear since in Test :(

~ Leilond
http://i67.photobucket.com/albums/h307/ss1shadow/Leilond_Progression.jpg

Found and fixed. Was present in DR2 as well.

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"The ninety and nine are with dreams, content but the hope of the world made new, is the hundredth man who is grimly bent on making those dreams come true." -E.A.P.