Playing on Xbox multi-player. For both the host and guest, there was no backpack spawn after we drowned in the depths (by the t Rex). Guest did see one bugged at 30000 cm away underground and getting further away as we moved toward it. Update: not just drowning. Also occurs when koi fish kills you in that area. Now 5 times in a row

Edited November 15, 20205 yr by Waller102
Added koi fish deaths

I have a similar issue but in the hedge maze.  I died by a bunch of spiderlings and my backpack fell in the crease of two branches but the icon was showing it was inside the branch where the two branches connected.  I ended up giving up since I could not retrieve it.