Crop and Rotate filter has an accumulative error in the cropping rect
1) Activate Crop and Rotate filter
2) Activate Autocropping function
3) Right-click on the angle slider to see the curve
4) Move the mouse quickly over the curve so that the CPU would not be able to handle all the update events
5) Stop moving the mouse.
After all the calculations are finished the image becomes rotated correctly, but the cropping rect is much smaller than the image itself. I have a feeling that the crop rect is still set to some older value when the image was highly rotated.