Bit of a weird issue here. It happens when pasting any drawing object that contains text from Word into the editor.
In IE, the drawing object is converted to a base 64 string. In Chrome and Firefox, the image src is a temporary file location found in the user's AppData (file:///C:\Users\USERNAME~1\AppData\Local\Temp\msohtmlclip1\01\clip_image001.png for example).
This is not an issue if you copy & paste an image or a simple shape or group of shapes from Word in any browser - all are consistently converted to a base 64 string. It only happens if you copy & paste a drawing object that contains text.
See Single Shape.docx. Copy and pasting the content into the Editor in any browser, all convert as expected.
See also Shape With Text.docx. Copy and paste converts to base 64 in IE as expected, although it looks little strange due to loss of font styles. Paste its content into Chrome or Firefox, though, and it will not convert. Instead, it is a reference to a temporary local file.
Is there any workaround to convert these objects consistently in Chrome and IE?