Steps to reproduce:

1. Create a new page
2. Add a line of text, like "lorem ipsum sit dolor amet".
3. Press 'enter' to start a new paragraph.
4. From the menu, choose "Insert > Info" to create an info macro.
5. Select the whole first paragraphs' text. You can achieve this either by triple-clicking the line, or by using the keyboard.
6. Press 'Backspace'.

The line of text will be removed, and the cursor will disappear shortly afterwards.

The cursor will only disappear after the whole contents of the paragraph is removed via deleting a text selection; it does not happen when your cursor is collapsed.

This behaviour occurs at any level of nesting. Repeat the same steps above inside a macro body and the same result will occur.