As the title says, any generic waypoints/objective markers have a chance to remain on screen indefinitely. This only affects the waypoints drawn directly to the screen, it does not seem to affect the minimap or expanded map.
This screenshot is from a few weeks ago, but the issue still persists:
Pictured: persistent generic objective markers and "Up" and "Down" elevator arrows from another tile.
Not pictured, the issue also frequently occurs for numbered player waypoints (1/2/3/4, including in single player, possibly only your own waypoint?) and "revive" markers when a pet or ally is downed.
Notably I have not seen the issue occur for lettered waypoints (A/B/C etc) or void traces. I've also not seen the issue occur for a player's item or mod waypoints (eg "Orokin Cell") after every player has picked them up. This is possibly because those waypoints are tied to specific objects and are removed with those objects, but without seeing how it works behind the curtain that's just speculation.
