keepInventory gamerule doesn't apply to Nether and End

It's very simple to reproduce :

• Do "/gamerule keepInventory true"
• Go in the Nether or End
• Use "/kill" command
• Notice that your inventory is now empty unlike in Overworld

The server I'm playing on is running 1.7.2, maybe it's important.
This is not a very important bug but please, fix it.