Banner image size for Traditional Projects

Continuing the discussion from Update Traditional Projects design to match Collections/Umbrellas:

The image size is 950px wide and a maximum of 400px tall. I was able to upload a PNG that measured 950x400 as well as a smaller one that was 950x290.

image

I do get the error if I attempt to upload an image that is less than 950px wide and/or greater than 400px tall, such as 900x400 or 950x401.

image

I also tried get an image to fit the banner requirements, many many times some months ago, but even when I got an image to the exact width and limited height, it didn’t work.