I found two different versions of part 54090 (Aircraft Fuselage Forward Bottom
Curved 8 x 16)
The first version has one hole in the bottom, the second has two holes (see attached
picture)
Thanks for noticing this.
Here is what was done:
(1) An additional note was added to the catalog entry describing the two versions.
(2) Your image was added as an additional image to show the differences.
(3) The part was added to the "Unsplit Part Variants" list: https://www.bricklink.com/catalogRelCat.asp?relID=24