Hello dear Affinty Team,
I think I´m experiencing the same problem, too: I also work on an iPad Pro 2018 12.9“ (iOS 12.3.1) with Affinity Designer and it is not possible for me to duplicate default brushes. In the moment I push the “Duplicate“-Button in the fly-out menu (after a long press) the program crashes without a crash report. However, duplicating self-made brushes works flawlessly.
Another observation: If I draw a vector brush and select it after working with other brushes again, I won‘t be able to find any information about it´s properties showing up in the brushes studio or anywhere else. The brushes studio panel only highlights the last used brush type, but not of the selected brush stroke. On desktop, there is this property panel on the top of the workspace, is this feature lacking in Designer for iPad? Even the stroke width does not seem to be synchronised between the context menu on the bottom and the panels on the right.
Thank you very much for any help/fixes, if you need more information, feel free to ask.
Best regards,
Peggy