A faint nebula in the Triangulum galaxy, Messier 33 

This fall I captured several tens of hours of images on the Triangulum galaxy, Messier 33. I used the popular broadband approach (LRGB), but also gathered more than 100 hours in narrow band filters in order to see the star forming regions and rich nebulae in this neighbouring galaxy. The image also shows some IFN around M33.
The resulting image has more than 150 hours of exposure captured from my backyard, located in a Bortle 4 dark sky in the south of Barcelona.
In this video I highlighted a faint nebula detected in the [OIII] and Ha channels that I did not find in any catalogue. I would be pleased if anyone could let me know where to find more information about it.
Thanks so much for your time.
Image details:
FSQ106:
L: 271 x 300" (22h 35')
Ha: 534 x 300" (44h 30')
RGB: (24 x 300") x 3 (6h)
FSQ85:
[OIII]: 969 x 300" (80h 45')
Calibrated with darks, flats and dark-flats
Total exposure: 153h 50'
Moon at 30% (on average)
Image resolution: 1.46”/pixel
FOV (full image): 2º 23' x 1º 34'
Equipment:
FSQ106 EDX4 + ASI2600MM + LRGB Astrodon filters + Ha3nm Antlia - with ZWO EFW 7 posFSQ85 + ASI294MM + SHO LRGB Baader filters - with ZWO EFW 8 posMesu200 mountGuiding with ASI120MM and ZWO Mini Guide Scope
Aleix Roig, November 2023
Prades (Tarragona, Catalonia - Spain).