Updating a video file in the library does not update video properties

I downloaded a 1600 pixel video file and overwrote the existing 848 pixel video file in the Mezzmo library folder. The file names were the same. In Mezzmo the video properties remained at 848 pixel. I then manually added this new file to the library. Properties remained at 848 pixel. I refreshed but still 848 pixels. I deleted the 848 pixel file and added the 1600 pixel file. Now the properties shows 1600 pixel.

Is this a bug? Or what is the proper procedure for overwriting a video file so properties are updated?

You could go to Properties dialog, then the Video tab and use the "Get Properties" button - that should update it.