I am seeing the following React warnings when selecting the Accessibility panel and enabling the feature

Warning: Each child in a list should have a unique "key" prop.

Check the render method of `AccessibilityTreeFilter`. See https://fb.me/react-warning-keys for more information.
    in hr (created by AccessibilityTreeFilter)
    in AccessibilityTreeFilter (created by Connect(AccessibilityTreeFilter))
    in Connect(AccessibilityTreeFilter) (created by Toolbar)
    in div (created by Toolbar)
    in Toolbar (created by Connect(Toolbar))
    in Connect(Toolbar) (created by MainFrame)
    in div (created by MainFrame)
    in LocalizationProvider (created by MainFrame)
    in MainFrame (created by Connect(MainFrame))
    in Connect(MainFrame)
    in Provider react-dev.js:276:32
Warning: Each child in a list should have a unique "key" prop.

Check the render method of `SimulationMenuButton`. See https://fb.me/react-warning-keys for more information.
    in hr (created by SimulationMenuButton)
    in SimulationMenuButton (created by Connect(SimulationMenuButton))
    in Connect(SimulationMenuButton) (created by Toolbar)
    in div (created by Toolbar)
    in Toolbar (created by Connect(Toolbar))
    in Connect(Toolbar) (created by MainFrame)
    in div (created by MainFrame)
    in LocalizationProvider (created by MainFrame)
    in MainFrame (created by Connect(MainFrame))
    in Connect(MainFrame)
    in Provider

I am still seeing the problem

Honza