This is game breaking for some very dedicated players.
Not sure if it's the new client backups or what, but this has messed up the game worse than it was prior to full release.
Almost everytime I log out, doesn't matter whether I try stand in place and refrain from picking up or dropping anything for a time period, or not. I get set back, to some random point in time, with barely anything I have acquired. Needs to be addressed by this next update if not before. Immediately, is an understatement.

In T136458#1815105, @Geez wrote:

Hello hiporchestraslut and thank you for the report.
This is an issue we are aware of and we are currently working on a fix.
Regards,
Geez

I think there is an intended 3-4 hour persistence timer on backpacks, unless it's a crafted bag, then it has something like 10-15 minutes.
I've a list for item persistence that includes various types of containers and items along with their intended time frames. Granted that is if the times listed are accurate and not revised or bugged.
If you'd like I can forward it to you.

GT: Blamblamboonie
Server: US xxx4212
Time/Date: approx. 6:45pm 9/19/18