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Above you see a screenshot with some elements created in Draw. I marked all the elements and exported the selection to *.png. Then I imported it here again. The exported *.png hasn't the same width of the visible area. It has a transparent area at the right.
I had created the arraow by changing a normal arrow to a cirve and then worked with the points to get something like a half circle.
Screenshot shows the reason while export fails. While changing the point I moved the "helper" (don't know the right word) outside the background of the screenshot.