Herbalism - bugged Fel-Encrusted Herb

[weedwood]

WoW Freakz link: https://www.wow-freakz.com/object_finder.php?object=273052&&name=fel-encrusted-herb
Bug description: Hello, I have been farming these fel encrusted herbs for my flasks, but I have discovered that a certain one does not despawn after collecting it once, and it allows me to loot it twice.
First proof is collecting it for the first time(you can see the clock on the right and the loot it gave me in the chat as I use auto-loot).
Second proof is collecting it for the second time(exactly the same time on the clock, this has a 5 minute respawn timer so it is not possible to be there already, and another different loot again in the chat).
Third proof is its location on the map.
Proof#1: https://imgur.com/a/O49yZ9O
Proof#2: https://imgur.com/a/8vfmIYC
Proof#3: https://imgur.com/a/RHRbupp

[Dwynen]

That's not what's happening, two nodes spawn in the same position, so, when you harvest the first one, it dissapears but there is another one in the same spot. It also happens with mining nodes, and then you can see it better, because some veins have different minerals, so you see, for ex., a leystone and a felslate nodes together.