VisualEditor customized image dimensions not being imported correctly

We have issues with image sizes when importing from Mediawiki that I'm trying to figure out.  The Mediawiki syntax exported is showing 1:1 aspect ratio on images embedded in the page even though they are configured differently in the visual editor / media settings / advanced settings editor.  For example:

1) Image KMISPic.png file page shows original file size 1,100x636 in Mediawiki

2) Image is embedded into Mediawiki page and edited using the visual editor to a custom size 538x311

3) When viewing Mediawiki markup, image is displayed as:  

[[File:KMISPic.png|right|frameless|538x538px]]

4) When viewing actual Mediawiki html source the img has style applied with different dimensions:  

img[Attributes Style]

5) After importing into xwiki markup image is displayed with the incorrect 538x538 dimensions instead of  538x311 so image is distorted due to 1:1 display ratio:

[[[[image:KMISPic.png||alt="frameless" height="538px" title="frameless" width="538px"]]>>attach:KMISPic.png]