Here is the two of two:
I have noticed that when an image is embedded in a quote line and has a caption field, it is displayed twice.
Example MD and screenshots:
Embedded image with caption:

in a quote line:
> 
Embedded image without caption:

in a quote line:
> 
PS. However I am not sure if embedding an image in a quote line is OK in MD, I do it to indent the image.