No copy/gacha item disappeared on rezzing. Clearing caches etc. did not help.

[Alwin Alcott]

not on the sim

not in your inventory...

ehm

no copy....

 

yes.. that's gone..

sorry

[Alwin Alcott]

not on the sim

not in your inventory...

ehm

no copy....

 

yes.. that's gone..

sorry

[CassieMaia]

Sometimes I have found the no copy item in my lost and found folder after re-logging.

Some things I do to try and minimize issues with rezzing no copy items:

 - stand on actual ground (not inside a house, for example)

- make sure the parcel is one I have rez rights in (and I have the appropriate group tag activated, if applicable)

- rez the item down right by my feet 

[Amethyst Jetaime]

Check the <0,0,0> location on the sim.  The sim will sometimes put things there that it doesn't know what to do with.  You may find a whole pile of stuff there, so look carefully.