Not sure if this is a glitch but when grav renders -  the resulting html is
How can I get markdown to just render img tag?
You could find the image tag in the string with twig and then replace what is before and after, but if you search on the gitter channel i know that @OleVik has posted something about this
That’s really a limitation of how markdown works. You can add a class and float the image left or right and it will overflow out of the <p> tag and render as expected.