I do have issue that has nothing to do with 3rd party plugins, but with Affinity itself.
Affinity flawlessly stitched together a 17 image 360 degree panorama. The problem arose when I selected Rectangle to Polar to make a "Global Panorama. It keeps clipping the top and bottom of the 'orb'.
I have tried resizing the canvas prior to selecting Rectangular to Polar, but it got me a hollow ring panorama.
I've looked and can't seem to find a setting to end up with this (done in other photo editing software)