UnifiedMap: Same waypoints being added/visible multiple times to/on the map

[moving-bits]

Having been on a short tour today I noticed a strange behavior wrt to waypoints as part of an individual route:

Somehow I managed to have the same waypoint twice or even three times on the map, so when long-tapping on that waypoint (to get the long-tap popup to remove it from the individual route), that waypoint got listed twice or even three times in the popup menu.

IMHO the underlaying data structures should prevent adding a waypoint (or a cache) multiple times to its list. On adding the same element (identified by its GC code / waypoint id), the existing version should be removed first.

[moving-bits]

May be the same or have the same cause as #15412 (haven't checked the displayed route length at that moment)

[ztNFny]

Yes, this is "standard" behaviour with routing on unified map. it's pretty much unusable - which is the main reason i still use old maps for trails. I considered it covered by #15412