When a sentence in a block wraps onto another line and this line begins with a Markdown such as **, the caret will ignore the line, skipping over it when navigating inside the block with the arrow keys. Inserting (and removing) an extra space before the Markdown will fix this, I can then navigate through each line with the arrow keys. Removing (and inserting back) the original space before the Markdown will re-trigger the skip-over behavior.