Hi I am Affinity Photo user v 126.96.36.199 and I have noticed that when importing a Fujifilm raw file (RAF), the original image size (document size) is altered when importing such file in Affinity.
For example: an original fujifilm RAF file of 4896x3264px is automatically imported as 4934x3296px file size document.
I still have to manually type the correct pixel size of the document when exporting the edited image.
Though, no issues when importing fujifilm jpg file format.
Please find attached screenshot.