When the Pick Block function is used on a map inside an item frame, you get a copy of that map that never updates your position. That is, the arrow or dot marking your position on or relative to the map never moves on a Pick Blocked map.
This only happens sometimes; I have no idea what makes certain Pick Blocked maps work and others not.
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duplicates 2
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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.
Still an issue, however I don't know if this is a "pick block" issue - but resetting the server host application will bring back your white location arrows for a while. This seems to happen with copied maps a lot.
See comments in MC-73 for similar stories.
Reopened MC-73
I've got a map that has no pointer or dot when I'm in my home chunk. If I take it out of my home chunk the dot appears and the arrow appears when I get to the area where it was made. When I return to my home chunk the dot disappears again. The only unusual thing about the map is that it's entirely water (although you can see a few underwater features). I made it from a stack of empty maps and all of the other ones seem normal. I've tried having it in my hot bar or not having it in my hot bar as I travelled to see if that affected anything (it doesn't seem too) It's 1:1 zoom, just like the others. Putting in and taking it out of an item frame doesn't seem to do anything, nor does logging out and in.
1.18.1 Single player.
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This could be an issue where the map pointer is hiding below the map.