Image drag/drop doesn't work as expected

[nthsense]

I'm seeing some odd behavior related to image drag & drop in my own application as well as in the playground. Here is a screenshot from the playground which shows the issue:

Also, the following console error is shown:

Invalid path: unable to find block at index

To reproduce, type some text into the playground and then add an image. Once the image has been added, drag it around within the text a few times and note that the two sides of the playground no longer match.

In my own application, I use a web socket connection and load the same page in two different browsers. I have seen that when dragging the image to the end of a line of text, a space character may be removed from the text.