I was transferring a Generator I found from my vehicle and dropped it on the ground and it just vanished.
Generator Vanishing video clip: https://clips.twitch.tv/DrabCooperativePterodactylDatBoi-6fMom43AtZlwevfy
Another time I was transferring some Worms to a bag containing fishing gear as well as some worms. Again, the item I attempted to transfer just vanished.
Worms Vanishing video clip: https://clips.twitch.tv/CrazySplendidPotDatBoi-ZXQMx4rrvgdrnDVL
Another user on the server also experienced this when moving guns & ammunition from their inventory to a player built wooden crate. (no video for this)
I have attempted to reproduce this but have not been successful as of yet.