In Nazmir, there are two green trees that have fallen over and as the player approaches them, they flicker rapidly.
Location: Sethrak Front
Repeat Glitch: Start on the path going North by the NPC Chadwick Paxton. The Player will observe that the tree immediately North of the NPC flickers rapidly while standing next to the NPC and while riding on the path. The Green Tree opposite side of the path from NPC Chadwick Paxton also flickers rapidly.
Update: All of the green trees which appear to have fallen over or are broken halfway up their trunks, exhibit this flickering during the flight from Zul’Jan to Gloom Hollow and especially along the flight path over flying the Zalamak area.
Update: While doing the World Quest River Troll in the Frogmarsh area a patter was noticed in that pressing ALT-Z to remove the User Interface caused the flickering to stop. Standing in another area, pressing ALT-Z to return the User Interface to the screen stopped the flickering.
Notes: The Green Trees are the same model. The flickering is so bad that is not only extremely distracting while trying to complete the quest, it is giving me a headache.
The flickering is obvious and distracting towards game play.
Former Activision QAMN 
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I know this is kind of an old post, i found it googling a possible solution. Messing around in the settings i found that when i disabled multisample alpha-test, the flickering went away completely.
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OMG, thank you Duckgoquack! I can confirm that this works.
I’m having this problem with all the foliage in Shadowlands right now, gonna try your fix
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What solved it for me after upgrading my PC was to make sure that the Graphic Card was NOT “auto detected” (selected my GPU) under System > Advanced AFTER disabling multisample alpha-test.
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THANK YOU, this solved my issue!
This solution showed improvement on my system but what made the flickering go away 100% was getting off of DX12. DX12, what a pile of garbage!
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There’s a more recent flickering issue which has occurred as a result of the Cyberpunk 2077 Game Ready driver (460.79) release from NVidia. When using those drivers or anything newer, areas of trees - particularly Ardenweld - will flicker significantly. Switching to DX11 is one of a number of suggested fixes that have varying levels of success for some users, the others being to lower Particle Density or Shadows.
Thus far the only 100% fix is to use older drivers. This of course can represent an issue if you happen to be playing Cyberpunk, though there’s no reason the support profile couldn’t be backported from newer drivers.
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Makes sense as that was around the time when my issues started. My next step would have been to roll back the driver. To add to my previous statement, WoW or NVIDIA switched me to DX12 without informing me. Not sure why this was the case b/c my wife was not switched when she updated driver. DX12 will eternally be in beta and I would have not knowingly switch to it myself. I was also getting tired of WoW support and reddit telling me my GFX card was overheating.
make sure that the Graphic Card was NOT “auto detected”
This fixed my issue as well
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can confirm this works! thank you
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this worked for me disabling multisample alpha test lessened the problem but didn’t get rid of it this completely removed the issue
Intel UHD Graphics 620
Fix: System > Advanced > Graphics API > DirectX 11
Turning my Shadow Quality to Low also worked, but I couldn’t stand how crappy it made the game look
Multisample Alpha-Test and/or Graphics Cards options did nothing for me
Particle Density set to disabled did nothing as well
Notes: I only have this issue when there is a festival or Darkmoon Faire active. Graphics card was up-to-date with drivers
Thank you so much!! much love!