I can tap the "Copy" button, but nothing will be copied

[kkebo]

I added the feature to copy the text in f8c8fe5, however, it doesn't work. I can tap the "Copy" button on the context menu, but nothing is copied actually.

I tested on iPad Pro 12.9-inch 5th generation (iPadOS 15.3 beta) and iPhone XS (iOS 15.2).

Related links:

• https://stackoverflow.com/questions/69299113/textselection-copy-nothing