Other players don't show up on duplicated maps

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Note: this is a automatic message, so apologies if I miss something.

No response to query and cannot replicate in 1.6.2, assuming fixed.

Reopening. Player who created original map is able to see others properly, even on duplicated maps, while players with duplicated maps cannot.

Is this still a concern in the current Minecraft version 1.7.4 / Launcher version 1.3.8 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Running Minecraft version 1.7.5 / Launcher version 1.3.11.

Encountered issue in SMP that matches this description:

I've encountered a map bug in 1.6.4 SMP, which is similar to this one explained in the wiki:

Currently, placing a map on a wall in SMP using an Item Frame possibly causes an issue with maps held by players in which the location marker for the players 'disappear' under explored regions of the map, and preventing unexplored regions from becoming 'explored', effectively making all maps on the server useless. Deleting all of the map.dat files in the world data folder, as well as the idcount.dat file resolves the issue, unless players have maps in their inventory.

The difference is that despite not showing my marker, it does explore new areas, contrary to what is written there.

Also, "Deleting all of the map.dat files in the world data folder, as well as the idcount.dat file resolves the issue" is kind of vague: it may solve the issue, but does it cause any problem? Or are these only cache-like files?

Source: http://gaming.stackexchange.com/questions/132587/how-do-you-fix-the-map-green-arrow-bug

As I am not the server-admin, I have not attempted the suggested solution.

See screenshot taken by myself:

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

No response for over a year.

Is this MC-99378 / MC-99189