Can't See Target Issue

[Jakkal]

One of our latest updates has an issue that has interrupted a considerable amount of gameplay and we're trying to figure out what is causing it.

We need a list of chunks where this is an issue. There will be a variety of things that will go wrong in these areas. Your flying mount will drop from the sky. You can't cast on mobs. You can't hit mobs.

So, here's what I want from you:
1. Chunk name where it's occurring
1a. Are there any areas in specific where it occurs?
1b. Are there any areas in specific where it does not occur?
When you reply, make one reply and edit it if you find more. Don't post multiple times. Check to see if someone else has already put in the data you've found as well.

Here's a list of chunks that I've found that does suffer from the issue, but I haven't had time to check out the whole chunk

Thelaseen - Part of it near the dungeon
Vol Tuniel
Wardship - Part of it
Tursh Village
Ruins of Trengal Keep
Old Targonor
New Targonor
Southwatch
Bordinar's Cleft
Renton Keep
Silverlake
Coastal Graveyard
--Has the issue on the eastern side of the chunk
--Does not have the issue on the western side of the chunk

I have a suspicion of what these chunks have in common though I haven't been able to definitely prove it (As other chunks with the same conditions are working just fine). So if you can add to this list with more detailed info, that would help a lot.

[Orous]

Thelaseen - Part of it near the dungeon
Vol Tuniel
Wardship - Part of it,
Tursh Village
Ruins of Trengal Keep - The roughly North 1/3 of this zone seems fine, the lower 2/3 surrounding the keep seem entirely afflicted.
Old Targonor
New Targonor
Southwatch
Bordinar's Cleft
Renton Keep - This entire zone seems afflicted including the ant hive interior. I could not cast on anything or fly anywhere in this chunk.
Silverlake - The only place in Silverlake I could find that would let me fly and cast on mobs was around /loc 13895, - 67077, 36859. The rest of the zone seemed to be afflicted.
Coastal Graveyard
Kaon's Rush - All along the eastern edge of the chunk the mobs appear to behave normally and are able to be cast upon. This holds true only for the extreme eastern border. The rest of the chunk appears afflicted. I could fly only in the area where mobs behaved normally.
Veskal's Exchange - All good
Misthaven Crossing - All good
Three Rivers - All good
Shrine of the Flame - The crow areas on either side of the large gate next to the warp crystal into the zone seem to work. The rest of the zone does not.
Martok - A section of the NE/4 of the zone works. This begins around 83971, 8900, 539. The norther area leading in to the Grimsea Coast seems ok too. The rest of the zone seems afflicted.
Martok Coast - All good

[Zukan]

Qa Riverbank
Ksaravi Gulch
Tauthien Delta
Skawlra Rock
Skrilien Point
Strand of the Ancients
Zossyr Hakrel
Karrus Hakrel
--There are certain small pockets scattered around the chunk where I can fly and attack.

[theFoof]

I committed the changes i've been working on with collision for the last week or 2 so it should have fixed a bunch of issues with this