I have found the following behavior around this issue. Below steps restore the inventory but it takes commands on the server for each player every time they join.
Server is setup with gamemode=1
Player1 joins the server
Server issues command gamemode 0 Player1
Server issues command gamemode 1 Player1
Inventory is now restored to Player1
I have found the following behavior around this issue. Below steps restore the inventory but it takes commands on the server for each player every time they join.
Server is setup with gamemode=1
Player1 joins the server
Server issues command gamemode 0 Player1
Server issues command gamemode 1 Player1
Inventory is now restored to Player1