This is occurring when we select 'Play in RV' on Shotgun with a Version of an image.
Despite the Version having a specific image in it's Uploaded Movie/Uploaded Movie Image field, and the path_to_frames/path_to_movie also pointing to a specific image, RV will open a sequence of images with the same naming convention in that folder.
The naming convention of the image is 'assetname_design_V033.jpg'
There is no data within that Version that points to or specifies an image sequence.