The map pointer will change to a circle (showing you off map) before you actually leave the map area. I went to -64,-64 (top left corner for all levels of maps made around 0,0). On a level 0 map, it will change to a circle at -64,-64. A level 1 map it will change at -63 (2 blocks away), lvl 2 at -61 (4 blocks), lvl 3 at -57 (8 blocks) and level 4 at -49 (16 blocks).
I filled in an area 16x16 in the northwest corner of the map and made a map for each level. I stood at -49,-49 and changed maps. Pointer changes to off map on the level 4 map. Screenshots are an example at level 4.
I thought this may be intentional to show you're at the edge of the map but it can be confusing and make you think you're actually off the map rather than just on the inside edge of it.
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is duplicated by 3
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If I’m reading the comments on the first ticket marked as a duplicate of this one, this bug is particularly troublesome because markers don’t appear properly on the last pixel at the edge of the map, and therefore placing a map or banner on -64 would not show a marker on the map for Zoom Level 0 at -64, Zoom Level 1 from -64 to -63, Zoom Level 2 from -64 to -61, Zoom Level 3 from -64 to -57, and Zoom Level 4 from -64 to -49.
Meaning at Zoom Level 4 if you stiched two maps together in picture frames any maps or banners in a /two chunk/ radius wouldn’t be visible on it at the edge of each one, in addition to every player appearing as a circle in that 32 block area at the edge of the two maps.
I added a screenshot showing how when in the affected area at the edge of the map neither a banner or a map frame will appear on it at all.
Edit: Someone on Reddit posted about this bug and they had a gif demonstrating the effect on banners and item frames: https://gfycat.com/QuerulousBitesizedDikkops
Edit 2: Someone else on Reddit posted about having fixed the bug themselves in their own mod but doesn't have an account on the bug tracker so here is a link to their comment on Reddit: https://www.reddit.com/r/Minecraft/comments/93h5b4/found_an_interesting_bug_with_maps/e3dodzk/
Confirmed.
When having two adjacant maps in the maximum zoom level and traveling in direction of the map border, the circle is displayed on both maps some time.