Execute the 'goto paragraph start' command with the cursor on the first character of a paragraph.
Expected (from helix and kakoune): The character that was under the cursor is not part of the new selection
Actual: The character that was under the cursor is part of the new selection.

To make this clearer, here's an example setup where you can see this happening.
Setup a text document like this:

foo

bar

move to the end of the document, and use goto previous paragraph twice.
expected: the b in bar is not selected.
actual: the b in bar is selected.