This is about PDF export from Affinity Publisher. Tested with AP 2.1 and AP 2.2 b6711, iPadOS 16.6, iPad Pro 12.6 (6th generation).
I have two objects, seemingly the same colour (left). When saving as PDF (for print) (vanilla settings), one gets a wrong colour for one of the objects:
I enclose the original afpub file and the exported pdf.
As this is for a soon-to-be-published book with many occurrences of this bug, I hope it will be fixed soon.
Best regards,
Hans
colourtest.pdf colourtest.afpub