I'm seeing the exact same thing as @mattreimer. This looks like an iOS bug because the exact same code using textContent works fine in Mac Catalyst. It also seems to work fine in the simulator.

Quinn, thank you for the very though answer. I guess I'll hold tight and see what happens to Mac Catalyst apps on Sequoia. I'll also notify the NetNewsWire team that a fix needs to be made prior to the Sequoia public release.