Backpack contents keep being deleted after a few minutes of being put into backpack

ive got stuff in backpacks and its survived though numerous Deaths 
So seems to be working fine here

Check your config, my stuff has lasted not only a few deaths but also several wipes

Config is fine. Backpacks was working fine for me before the update.

Please check whether you can find any errors in your server console or logs about the time when your backpack contents seem to disappear.

No errors

Merged post

Config looks good, but all the data files are empty. Backpacks.json  

@LaserHydra,  I found it, it is writing my backpack contents to 0.json and not the file with my player ID. So for some reason I am being identified as 0.

That is an interesting find, thank you for that. I'll try to figure out why that's happening.