Locked crate on oil rig vanishes

[Catastrophology]

Large oil rig and oil rig both, sometimes, by the time I reach top, vanishes. Sometime even infront of me.

For a time, I thought that maybe, it takes too much time to do the rig and it despawn after a certain amount of time.

But, recently, after clearing the rig in less than 15 minutes, and the crate did despawn.

Getting annoying, talked with admins, and they tell me only de devs can do something about it.

So please, do something

thanks