Message from @unknown
There has been a long-lasting misunderstanding of what this ticket is reporting. I think we have now cleared that up, and I have attached a demo world (MCPE-25717.mcworld) which clearly illustrates that this is not working as intended.
Locator maps placed in item frames that are in blocks corresponding to the pixels on the left and top edges of the map do not show a green indicator. For example, a level 0 locator map centered at (0,0) maps the blocks from (-64,-64) to (63,63). It should display a green dot indicator if mounted in an item frame anywhere within that square of blocks. However, if placed in an item frame located anywhere from (-64,-64) to (63,-64) (the northern edge of the mapped area) or from (-64,-64) to (-64,63) (the western edge), it will not display the green indicator.
Note: This bug is probably the result of confusing the center point of the map with the block having the same coordinates. The block itself is to the east and south of the center point. If it is treated as the center of a square of blocks, that square must have an odd number of blocks on a side, so for a level 0 map with center (0,0) the mapped area would range from (-63,-63) to (63,63), which is the area within which the green indicator actually does appear. But this is incorrect logic, because a map always covers a square of blocks with an even number of blocks on a side.
Steps to reproduce:
In any convenient world, go to coordinates (0,0).
Activate a locator map.
Move to (3,-64).
Place a solid block at (3,-65), then place an item frame on it at (3,-64).
Place a copy of the map in the item frame.
Notice that the map does not display a green indicator.
Destroy the map, then move to (-64,5).
Place a solid block at (-63,5), then place an item frame on it at (-64,5).
Place a copy of the map in the item frame.
Notice that the map does not display a green indicator.
Expected results:
The map displays a green indicator because the item frame in which it's mounted is within its mapped area.
Observed results:
No green indicator appears on the mounted map.
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this is still an issue in 1.2.10. mojang, please fix this! i have explored a large world (>1gb, more than 16 fully unzoomed maps) and all my bases are marked (or were marked) with a map in an item frame.
with this bug minecraft has lost its fun for me...
As a consequence of this bug, a map wall built within the area it maps will have no green indicator in any of its maps if it happens to be positioned just right (or just wrong! 😃). You can work around the problem by shifting the entire set of maps one item frame to the left or right.
still an issue in 1.2.11. this issue is similar to the one that auldrick described on sept 2017, but might vary from the one that auldrick created on 11. mars 2018.
steps to reproduce (tested on several android devices):
create a locator map of any zoom level, place it in an item frame -> green indicator appears
move away to a new spot in the same map, place another item frame, place a copy of the map
expected: a second green indicator appears
observed: the first green indicator disappears, only the second (most recent) remains visible
this can seriously hamper gaming experience for people exploring the world, building new home bases and making them visible on the map with green indicators (from locator maps placed in item frames)...
@jamino: That's a different bug, MCPE-25487. You might want to upvote and watch that one.
It appears that there is a border around the edge of the mapped area, where if the map is placed in an item frame, then no green marker will appear.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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No, it's not a duplicate. Compare the screenshots. That report is about a map carried in hand and a green indicator representing a map far away. This is about an indicator on a map in an item frame disappearing when you move the item frame 1 block. It doesn't seem likely that they would have the same root cause. Besides, the other report was closed a year and a half ago.