Steps to reproduce:

1. Type a word.
2. Select it.
3. Open the link tool.
4. Type your desired link without looking: http://example.com
5. Look at result: example.com/http://
6. Realize that when it "helpfully" switched you to the "External links" tab, it moved your cursor back to the start.
7. Contemplate the narrow distinction between "cursors" and "cursers".