jpeg extension not allowed by default for image upload when jpg is checked

I added a file component so that users can upload an image. I checked all the check boxes under web images, but the jpeg extension is not accepted (message: The specified file mypicture.jpeg could not be uploaded. Only files with the following extensions are allowed: gif jpg png.). I would expect that jpg also accepts jpeg.

This is a bit on the edge of being a bug or feature request, but as there is an old issue that solved it in 5.x (#278555: Files with the 'jpeg' extension are not allowed), I file it here as a regression thus as a bug.