_canonical_uri issue with Drag and Drop external files on Windows 10

When I drag and drop an image file into a fresh Tiddlywiki (v5.1.21) in TiddlyDesktop on Windows 10 the auto-generated _canonical_uri is incorrect. If I open the tiddler containing the imported image, I received the 'broken-image-link' thumbnail. If I delete a single period from the front of the auto-generated _canonical_uri, the image shortcut is fixed.

Example Directory Structure:
Tiddlywiki.html
|
| -- images\ example.jpg

If I drag and drop "example.jpg" into Tiddlywiki.html in TiddlyDesktop, the auto generated _canonical_uri is currently "../images/example.jpg" (note the leading double periods) and the image is not displayed properly in the resulting tiddler. If I remove a single leading period (to indicate current directory), the image link is corrected and the image is displayed properly. I have tested this on a couple machines and the behavior is the same on both. The auto-generated _canonical_uri is always one directory higher than the actual path of the file is.

Reproduce the drag-and-drop import in TiddlyDesktop v5.1.21 on Windows 10 using the directory structure and example.jpg described in the report. Trace how the external file path becomes _canonical_uri, then verify that the generated URI points to the actual image location and the imported tiddler displays the image.