I posted this in the main software thread but this may be specific to 16.1 and the iPads. After the installation I realized I was unable to use my Magic Keyboard delete key to delete an email message. I realized that none of the messages in the message list were highlighted in blue, regardless of tapping on them with my finger or using the trackpad to select them. Tapping on one brought it into the message window but they all remained grey or turned blue but immediately reverted back. Not wanting to restart my ipad at that time I force quit Mail and afterwards highlighting in blue worked properly again and I could use the keyboard to delete or select any that I wanted.
This morning I did restart my ipad and the issue returned. I again force quit Mail and resolved the issue. It’s odd that instead of fixing the issue restarting brought it back
This morning I did restart my ipad and the issue returned. I again force quit Mail and resolved the issue. It’s odd that instead of fixing the issue restarting brought it back