The Dark Nebula between Western Veil and Pickering's Triangle (Unknown catalog number)

A dark nebula that caught my eye when I did a hard scratch on the background as part of my Mosaic error investigation.
For the time being, the error analysis of Mosaic was over, so I pulled out the dark nebula.
I didn't know there was something like this in a place like this. There is also a box-shaped dark nebula on the south side (on the right side of the photo, not included in this photo), but the angle of view widens and I lose concentration. .
At first, I thought it was light pollution, mechanical error, or editing error, but when I looked at about 200 photos of this area on the net, there was only one photo of this object. (NASA APOD 20220622)
This is definitely not an error, it seems to be there.
Western Vail and Pickering seem to be connected by a bridge in this dark nebula.
At the bottom left is something resembling an Elephant Trunk.
If anyone has information on this dark nebula, I would be honored to be able to share it with you.
The palette of H-Alpha was changed because H-Alpha as it was became like a picture of hell.

最初は光害かメカニカルエラーか編集エラーかなと思ったが、ネットで200枚くらいこのエリアの写真を見ていったら、このObjectが写っている写真が1枚だけあった。(NASA APOD 20220622)
Western VailとPickeringはこの暗黒星雲でのブリッジで繋がってる様にも見える。
左下にはElephant Trunkに似たものある。

Place: Backyard East Pattaya (Bortle Class 6, Moon Phase 92.7%)
Shot Date:14th / Aug / 2022 1:20 (UTC+7)
Celestron C11 HyperStar C11 (2800mm F/1.9 f/540mm)
filter: Baader High speed ultra narrow band filter SHO
Panel 1
Ha: 10X180Secs 30minutes
Oiii: 10X180Secs 30minutes
Panel 2
Ha: 10X180Secs 30minutes
Oiii: 10X180Secs 30minutes
Total 2 Hour
Palette: Target : HOO(False)
Gain: 120、BIN2
Mount :iOptron CEM70G
Guide: SVBony 60mm F/4, QHY290C
Pre-Processing APP No Drizzle 2Panels Mosaic
Post-Processing PI,PS
Shot By Taro Seki