GIMP 3.0.4 problem

[vulpus]

When I select part of an image to edit it in some way (e. g., rotate it), then choose Export As, and then choose to Replace the image with the same name, etc., etc., after I close the image and reopen it, all the areas outside of what I selected are gone (have been replaced with black fields).  In other words, it is also doing a Crop To Selection although I absolutely do not want this.  What needs to be done to stop this?  My GIMP 2.10.38 never did this.