Top row of on-screen keyboard fails to work when typing fast

This is a fantastic app - thank you so much!

There is a bug that drives me mad, though, and it would be great if there were a fix. On my iPad, if I tap any key in the "normal" part of the keyboard (e.g. any letter), and then very quickly tap a key in the top row (e.g. " or '), then the second key tap doesn't insert the character, but instead the cursor jumps to where I just tapped, as if the top row of the keyboard has disappeared (though it hasn’t). This makes touch-typing with the on-screen keyboard extremely difficult, as key presses are missed and the cursor jumps around.

This bug is 100% repeatable for me, and happens in portrait and landscape (though it's much easier to see the issue in portrait). Load a document that is longer than one screen height and make sure it goes beyond the bottom of the screen, and type, say, f, quickly followed by “ in the top row. You should see the cursor jump to the position under the “ key, and without entering the “ character.

I’m on a standard iPad (5th gen) and iOS 15.1, but this has been happening since a bought Textastic a couple of years ago.

If you can repeat this issue, it would be wonderful to fix it.