Three warnings appear upon each breadcrumb switcher opening:

Warning: Failed prop type: Invalid prop `resourceSwitcherItems[0].id` of type `number` supplied to `BreadcrumbBar`, expected `string`.
    in BreadcrumbBar (created by Connect(BreadcrumbBar))
    in Connect(BreadcrumbBar)
    in Provider

Warning: Failed prop type: Invalid prop `resources[0].id` of type `number` supplied to `BreadcrumbSwitcher`, expected `string`.
    in BreadcrumbSwitcher (created by BreadcrumbBar)
    in BreadcrumbBar (created by Connect(BreadcrumbBar))
    in Connect(BreadcrumbBar)
    in Provider

Warning: Failed prop type: Invalid prop `resources[0].id` of type `number` supplied to `BreadcrumbSwitcherPopover`, expected `string`.
    in BreadcrumbSwitcherPopover (created by BreadcrumbSwitcher)
    in BreadcrumbSwitcher (created by BreadcrumbBar)
    in ol (created by Breadcrumb)
    in Breadcrumb (created by Breadcrumb)
    in Breadcrumb (created by Breadcrumb)
    in Breadcrumb (created by BreadcrumbBar)
    in div (created by BreadcrumbBar)
    in BreadcrumbBar (created by Connect(BreadcrumbBar))
    in Connect(BreadcrumbBar)
    in Provider