Still image pixel aspect ratio wrong in exported video (but correct in Premiere renders)

I've saved a targa still image from my footage and added it to the bin. It's properties show as follows:
Image Size: 1440 x 1080
Pixel Aspect Ratio: 1.3333
This correctly matches my sequence settings as I'm working with 1080p widescreen footage.
The image appears as expected in the Program window both before and after rendering previews. However, once I export my sequence as a video file, the still image is squashed (displaying incorrectly):
A work around would be to stretch out the still to a width of 1920 in Premiere so that the export displays it back at its normal aspect ratio - which works - but I don't understand why I should have to do this.
The other solution I found was to go to the bin and 'Modify > Interpret Footage' and although "Use Pixel Aspect Ratio from File" already shows the correct settings, to actively reset it (to the same pixel aspect ratio)  with the 'Conform to' option:
This works too.
Surely a bug?
(using Premiere Pro CC)

Thanks for the quick reply. But then why does the still's properties (in my bin) show the pixel aspect ratio as 1.3333 (not square pixels, 1.0) and should it not appear incorrectly in both the preview renders and the exported video ? This seems inconsitent to me.

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