│ BUG: invalid WebView instance: UnknownWebView(WebViewId(PainterId(0), (0,106))) (thread main, at components/servo/webview.rs:391)
  │    0: servoshell::backtrace::print
  │    1: servoshell::panic_hook::panic_hook
  │    2: std::panicking::panic_with_hook
  │    3: std::panicking::panic_handler::{{closure}}
  │    4: std::sys::backtrace::__rust_end_short_backtrace
  │    5: __rustc::rust_begin_unwind
  │    6: core::panicking::panic_fmt
  │    7: core::result::unwrap_failed
  │    8: servo::webview::WebView::show
  │    9: <servoshell::desktop::app_state::RunningAppState as servo::webview_delegate::WebViewDelegate>::notify_focus_changed
  │   10: servo::webview::WebView::set_focused
  │   11: servo::Servo::handle_embedder_message
  │   12: servo::Servo::spin_event_loop
  │   13: servoshell::desktop::app_state::RunningAppState::pump_event_loop
  │   14: servoshell::desktop::app::App::handle_events_with_headless
  │   15: servoshell::desktop::events_loop::EventsLoop::run_app
  │   16: servoshell::desktop::cli::main
  │   17: std::sys::backtrace::__rust_begin_short_backtrace
  │   18: std::rt::lang_start::{{closure}}
  │   19: std::rt::lang_start_internal
  │   20: main
  │   21: <unknown>
  │   22: __libc_start_main
  └   23: _start