I know it's not quite a 'fix' for the issue, but Zonx (Fetish Nightfall UI author) has made a mod/plugin which allows you to pull up any map regardless what zone you are in.
I have had the same problem as you have, and with the above-mentioned mod I've skirted the issue by loading some random map from the drop-downs and reload the map for the zone I'm in. Doing so has cleared out the PoI's for the other zones.
I wasn't successful in finding this mod/plugin as a standalone download, but I know ThorUI has it included in its UI. Or you could always contact Zonx directly for it.
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