When using a map, if you log in and out of a world, server OR client, the map will load, but it wont show the player moving, or continue rendering more of the world when you walk if you haven't loaded the full map.
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Is this still a concern in the latest Minecraft version 13w48b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.