The bug
If a max zoomed out map is place in an item frame, then the player walks far enough away where the placed map isn't in loaded chunks, then saves and exits, then reloads the world, the item framed map's green marker may not show up until the chunk it is in is loaded.
Related issues
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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.

It still happens in 1.4.7 to a degree, the first map I put in an item frames's marker still displays, but after continuing to travel farther and placing more along the way, some disappear on saving then reloading.

This example shows the same map before and after a server reboot. In the first screenshot the white dot is missing but there are 4 green dots. In the second, the white dot is present but there is only 1 green dot. This happens pretty consistently.

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.

still present in 13w18c

Still present in 1.6.2.

Confirmed problem in 1.6.2. Also happens with player arrows, and can (sometimes) be seen when you walk to the very edge. Evidence shows that these markers are layered below the map itself.

1.7.x: Maps now display on a full block basis and no longer display player markers

Still a (very annoying) issue on 1.10.2. Map markers disappear in unloaded chunks after reloading world (or signing off/on Realm)
I even signed up for a Realm hoping it would persist with the always-on Realm, but alas...

Reproduced for 1.11
Suggestion to solve via feature, that is partially in game allready:
Add map landmarks, similar to one that present in Exploration map.
Possible way:
Map should be named on Anvil
Additional tag changes appearance from default one ( e.g. if tag is "Village", show village icon, etc.)
Add itemData, similar to one in exploration map.
As soon as map placed into Item frame, new instance added to set
That will allow to keep data in map without loading a chunk.
While removing map from the frame can be done only while chunk is loaded, i.e. should be updated on map anyway.

Great idea. Please pursue!

Still happening in 1.11.2. Can someone with sufficient permissions update the affected versions?

1.12 Is affected by this issue also.
Maps do not show markers until chunk is loaded. Behaviour should mark any placed framed map on any other cloned map, anywhere.
Please note, my 'environment' is MacOS 10.12.5

I have the same problem playing on Minecraft Realms with MacOS 10.12.6. Green markers only show for chunks that have been loaded during the current gaming session.

Still present in 1.12.2. Markers work fine until you logout and reload the world.
The map normally fills in a circular area around your current position. Any markers of cloned maps placed in item freames outside that area, will not show up upon relog. Markers only correctly show up again when visited.
Applies to both the Overworld as well as the End dimension.

Still happens in 1.13-pre2. The new banner markers persist but the old map-in-item-frame ones don't, so you get weird effects where sometimes there's a green dot overlaying your banner marker and sometimes there's not.