The paint bucket tool does not outline the selected pixel. It outlines a wrong pixel instead. This problem happens in 1.2.11.
+It seems that gradient tool has the same issue.
Thanks for reporting this issue. As a temporal workaround you can press the - minus key to reduce the distance of both cursors (it’s because the paint bucket has an internal brush size but it should ignored, and in this case, it’s giving us some problems).