iOS: Toggled action buttons display over keyboard

When all the action buttons are removed from above the keyboard and a keyboard button is pushed, the bar for the action buttons is hidden. If the action buttons are then toggled back on, they display on top of the keyboard. See attached gif:

Example code:

var showUndoRedoActionsField = true;

var win = Ti.UI.createWindow({backgroundColor: "#fff",layout: "vertical"});

var field = Ti.UI.createTextArea({width: 300,height: 50,top: 100,backgroundColor: "#f0f0f0",value: "Hello" ,showUndoRedoActions:true});

var btn1 = Ti.UI.createButton({title: "Toggle field"});

field.autocorrect = false;

//field.showUndoRedoActions = showUndoRedoActionsField;

btn1.addEventListener("click", function() {

    showUndoRedoActionsField = !showUndoRedoActionsField;

    field.showUndoRedoActions = showUndoRedoActionsField;

});

win.add(field);

win.add(btn1);

win.open();

Steps to reproduce issue
1. Launch an app using the above code on an iPad
2. Click on the textfield
3. Click the 'Toggle Field' button
4. Click any key on the keyboard
5. Click the 'Toggle Field' button

Actual Results
The action buttons are shown on top of the keyboard

Expected Results
The action button bar appears and contains the action buttons

Notes
This could be an iOS issue