The Paste button (using UIPasteControll) located on UINavigationBar is not shown at application startup on iOS/iPadOS 26. This issue will disappear when device is rotated or window size is changed. And this issue does not occur on iOS / iPadOS 18 and earlier.
I uploaded the sample project to github at the following URL. https://github.com/gpn-galapagos/PasteButtonApp.git
Has anyone had the same issue or knows a workaround?