I created a waypoint on a map with a white banner. Then I destroyed the banner. I had the map with me, so it updated it. But now when I reload the world (restart the server) the waypoint reappear on the map. No matter how many times I go to the place where the banner was, to reupdate the map, the marker reappears every time the world is reloaded.
Attached screenshots showing the problem : 1st screenshot showing the marker before approaching it, 2nd screenshot showing the marker being removed by map update, 3rd screenshot showing the marker reappearing after reloading the world.
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Here is the savefile on wetransfer.
I have the same issue running a 1.13.2 server, not on localhost.
The banner always "shows up" at its last known position, even after removing. (Last known = I had a banner marking my progress on a rail line build. It only shows up at the last place it marked, not all of the intermediate points.)
I have spent hours trying to reproduce this issue on a virgin server. I can not. I thought it might have to do with the chunk being unloaded during server restart.
But, it happens consistently on my main survival world. (My map walls are the main feature of my world and I find the stray banners irksome.)
( I am still on 1.13.2, so cannot comment on newer versions )
Removing a banner does not mark the map data dirty, so it will never be flushed. If you are working with a fully filled in map this is a problem. You must perform some other map-altering operation, like put a new banner out or lay some blocks.
If you are working with a partially filled map, it is enough to remove the banner and then wander over to new territory and fill a couple of pixels.
Can't reproduce.