Issue with styled-components causing crashes in blockEditor-rendering

TypeError: Failed to set an indexed property on 'CSSStyleDeclaration': Index property setter is not supported.
    at setValueForStyles (/static/js/vendor.bundle.js:10364:24)
    at setInitialDOMProperties (/static/js/vendor.bundle.js:11553:7)
    at setInitialProperties (/static/js/vendor.bundle.js:11784:3)
    at finalizeInitialChildren (/static/js/vendor.bundle.js:13263:3)
    at completeWork (/static/js/vendor.bundle.js:24762:17)
    at completeUnitOfWork (/static/js/vendor.bundle.js:27974:16)
    at performUnitOfWork (/static/js/vendor.bundle.js:27947:12)
    at workLoopSync (/static/js/vendor.bundle.js:27912:22)
    at performSyncWorkOnRoot (/static/js/vendor.bundle.js:27538:9)
    at <http://localhost:3333/static/js/vendor.bundle.js:16862:24>

    in span (created by styled.span)
    in styled.span (created by TextBlock)
    in div (created by DraggableBlockWrappper)
    in DraggableBlockWrappper
    in div
    in Unknown (created by TextBlock)
    in TextBlock
    in div (created by Header)
    in Header
    in div
    in Unknown (created by Element)
    in Element
    in Element (created by Children)
    in Children (created by Editable)
    in div (created by Editable)
    in Editable
    in Slate
    in Unknown (created by PortableTextSanityEditor)
    in div (created by PortableTextSanityEditor)
    in div (created by PortableTextSanityEditor)
    in div (created by PortableTextSanityEditor)
    in div (created by PortableTextSanityEditor)
    in PortableTextSanityEditor (created by PortableTextInput)
    in div (created by ActivateOnFocus)
    in div (created by ActivateOnFocus)
    in ActivateOnFocus (created by clickOutside(ActivateOnFocus))
    in clickOutside(ActivateOnFocus) (created by PortableTextInput)
    in div (created by PortableTextInput)
    in PortableTextInput (created by ForwardRef(PortableTextInput))
    in PortableTextEditor (created by ForwardRef(PortableTextInput))
    in ForwardRef(PortableTextInput) (created by PortableTextInputWithFocusAndBlur)
    in PortableTextInputWithFocusAndBlur (created by withPatches(PortableTextInputWithFocusAndBlur))
    in withPatches(PortableTextInputWithFocusAndBlur) (created by FormBuilderInput)
    in div (created by FormBuilderInput)
    in FormBuilderInput (created by Field)
    in div (created by Field)
    in Field (created by ObjectInput)
    in div (created by Fieldset)
    in div (created by Fieldset)
    in div (created by Fieldset)
    in fieldset (created by Fieldset)
    in div (created by Fieldset)
    in Fieldset (created by ObjectInput)
    in div (created by ObjectInput)
    in ObjectInput (created by FormBuilderInput)
    in div (created by FormBuilderInput)
    in FormBuilderInput (created by Field)
    in div (created by Field)
    in Field (created by ObjectInput)
    in div (created by ObjectInput)
    in div (created by ObjectInput)
    in ObjectInput (created by FormBuilderInput)
    in div (created by FormBuilderInput)
    in FormBuilderInput (created by SanityFormBuilder)
    in FormBuilderContext (created by SanityFormBuilderContext)
    in SanityFormBuilderContext (created by SanityFormBuilder)
    in SanityFormBuilder (created by EditForm)
    in form (created by EditForm)
    in EditForm (created by FormView)
    in div (created by RegionsWithIntersections)
    in div (created by RegionsWithIntersections)
    in RegionsWithIntersections (created by StickyOverlay)
    in StickyOverlay (created by Tracker)
    in Tracker (created by OverlayEnabled)
    in OverlayEnabled (created by FormView)
    in div (created by FormView)
    in FormView (created by DocumentPane)
    in div (created by ScrollContainer)
    in ScrollContainer (created by Pane)
    in div (created by Pane)
    in div (created by Pane)
    in Pane (created by Styleable(Pane))
    in Styleable(Pane) (created by TabbedPane)
    in TabbedPane (created by DocumentPane)
    in div (created by DocumentPane)
    in div (created by KeyboardShortcutResponder)
    in KeyboardShortcutResponder (created by GetHookCollectionState)
    in GetHookCollectionState (created by RenderActionCollectionState)
    in RenderActionCollectionState
    in Unknown (created by DocumentPane)
    in DocumentPane
    in Unknown
    in StreamingComponent
    in StreamingComponent (created by Context.Consumer)
    in WithInitialValueWrapper (created by DeskToolPane)
    in DeskToolPane (created by DeskToolPanes)
    in SplitPaneWrapper (created by DeskToolPanes)
    in div (created by Pane)
    in Pane (created by SplitPane)
    in div (created by SplitPane)
    in SplitPane (created by PanesSplitController)
    in div (created by PanesSplitController)
    in div (created by Pane)
    in Pane (created by SplitPane)
    in div (created by SplitPane)
    in SplitPane (created by PanesSplitController)
    in div (created by PanesSplitController)
    in div (created by Pane)
    in Pane (created by SplitPane)
    in div (created by SplitPane)
    in SplitPane (created by PanesSplitController)
    in div (created by PanesSplitController)
    in PanesSplitController (created by DeskToolPanes)
    in div (created by DeskToolPanes)
    in DeskToolPanes (created by DeskTool)
    in DeskTool (created by withRouter(DeskTool))
    in withRouter(DeskTool) (created by DeskToolPaneStateSyncer)
    in DeskToolPaneStateSyncer (created by RenderTool)
    in RenderTool (created by SchemaErrorReporter)
    in RouteScope (created by SchemaErrorReporter)
    in div (created by SchemaErrorReporter)
    in div (created by SchemaErrorReporter)
    in div (created by SchemaErrorReporter)
    in SchemaErrorReporter (created by DefaultLayout)
    in DefaultLayout (created by withRouter(DefaultLayout))
    in withRouter(DefaultLayout) (created by DefaultLayoutRoot)
    in RouterProvider (created by DefaultLayoutRoot)
    in LoginWrapper (created by DefaultLayoutRoot)
    in DefaultLayoutRoot (created by SanityRoot)
    in SnackbarProvider (created by SanityRoot)
    in div (created by SanityRoot)
    in SanityRoot
    in AppContainer

import styled from 'styled-components';

const H2Style = styled.span`
  font-size: 2rem;
`;

export default {
  title: 'Rich Text Test',
  name: 'richTextTest',
  type: 'array',
  of: [
    {
      type: 'block',
      styles: [
        { title: 'MyTitle', value: 'h2', blockEditor: { render: H2Style } }
      ]
    }
  ]
};

import styled from 'styled-components';

const H2Style = styled.span`
  font-size: 2rem;
`;

export default {
  title: 'Rich Text Test',
  name: 'richTextTest',
  type: 'array',
  of: [
    {
      type: 'block',
      styles: [
        { title: 'MyTitle', value: 'h2', blockEditor: { render: props => props.children } }
      ]
    }
  ]
};