Regarding the gradient issue, could you submit a new ticket? It was unable to reproduce the issue for the eng-team, do you have any custom components in the app?
Regarding the changes publishing issue, you see them in previewer but not in the live app even though you published the changes through the publish tab?
I submitted, this endless ping pong with the support team is exhausting. It’s that simple. Sometimes the gradient background doesn’t work and it displays a blank black background. Just deal with it.