mash: mus crash clicking shelf item to activate

(1) Run chrome --mash on linux desktop (the Chrome window should be active/foreground)
(2) Click the "QuickLaunch" shelf item (or between that and "Chromium - New Tab").
(3) Crash in_flight_change.cc: changed failed, type=15 (ui::ChangeType::REORDER)

[20706:20706:1003/130332:1725799198204:ERROR:in_flight_change.cc(65)] changed failed, type=15
[20706:20706:1003/130332:1725799198272:FATAL:in_flight_change.cc(66)] Check failed: false. 
#0 0x7fa99c66b9be base::debug::StackTrace::StackTrace()
#1 0x7fa99c6d23cc logging::LogMessage::~LogMessage()
#2 0x7fa99f1596f2 ui::CrashInFlightChange::ChangeFailed()
#3 0x7fa99f17f6a1 ui::WindowTreeClient::OnChangeCompleted()
#4 0x7fa99f0eb2f3 ui::mojom::WindowTreeClientStub::Accept()
#5 0x7fa99ce1f172 mojo::InterfaceEndpointClient::HandleValidatedMessage()
#6 0x7fa99ce1eb61 mojo::InterfaceEndpointClient::HandleIncomingMessageThunk::Accept()
#7 0x7fa99ce1c97a mojo::FilterChain::Accept()
#8 0x7fa99ce20a16 mojo::InterfaceEndpointClient::HandleIncomingMessage()
#9 0x7fa99ce315b9 mojo::internal::MultiplexRouter::ProcessIncomingMessage()
#10 0x7fa99ce30d74 mojo::internal::MultiplexRouter::Accept()
#11 0x7fa99ce1c97a mojo::FilterChain::Accept()
#12 0x7fa99ce120a5 mojo::Connector::ReadSingleMessage()
#13 0x7fa99ce12bc9 mojo::Connector::ReadAllAvailableMessages()
#14 0x7fa99ce12a51 mojo::Connector::OnHandleReadyInternal()
#15 0x7fa99ce1292b mojo::Connector::OnWatcherHandleReady()

In this case:
  ash::ShelfWindowWatcherItemDelegate::ItemSelected() calls 
  ash::WmWindowMus::Activate(), which calls:
  ui::Window::MoveToFront(), which calls:
  ui::Window::Reorder(), which calls:
  ui::WindowTreeClient::Reorder, which calls (via mojom):
  ui::ws::WindowTree::ReorderWindow, which returns failure because:
  ui::ws::WindowTree::CanReorderWindow returns false in this block:

bool WindowTree::CanReorderWindow(const ServerWindow* window,
                                  const ServerWindow* relative_window,
                                  mojom::OrderDirection direction) const {

... [passes earlier checks] ...

  const ServerWindow::Windows& children = window->parent()->children();
  const size_t child_i =
      std::find(children.begin(), children.end(), window) - children.begin();
  const size_t target_i =
      std::find(children.begin(), children.end(), relative_window) -
      children.begin();
  if ((direction == mojom::OrderDirection::ABOVE && child_i == target_i + 1) ||
      (direction == mojom::OrderDirection::BELOW && child_i + 1 == target_i)) {
    return false; << RETURNS FALSE HERE TO CAUSE ReorderWindow TO FAIL
  }

  return true;
}

Is this failing because the window is trying to order above itself?
Is there some timing/coordination issue between local/client orderings?