Wayfire wsets plugin random crash

Describe the bug
while fuzz-testing waypanel, I encountered this unexpected wayfire crash:

EE 2025-09-18 03:28:13.564 - [xwayland/xwm.c:1920] xcb error: op ChangeProperty (no minor), code Window (no extension), sequence 48409, value 4194316
EE 2025-09-18 03:28:13.564 - [xwayland/xwm.c:1920] xcb error: op DeleteProperty (no minor), code Window (no extension), sequence 48410, value 4194316
EE 2025-09-18 03:28:13.564 - [xwayland/xwm.c:1920] xcb error: op DeleteProperty (no minor), code Window (no extension), sequence 48413, value 4194316
EE 2025-09-18 03:28:13.579 - [src/api/wayfire/dassert.hpp:26] Cannot set different output for a view with a parent!
EE 2025-09-18 03:28:13.596 - #1  wf::toplevel_view_interface_t::set_output(wf::output_t*) ??:?
EE 2025-09-18 03:28:13.603 - #2  wayfire_wsets_plugin_t::send_window_to(int, nonstd::observer_ptr<wf::toplevel_view_interface_t>) [clone .isra.0] wsets.cpp:?
EE 2025-09-18 03:28:13.609 - #3  std::_Function_handler<wf::json_t (wf::json_t), wayfire_wsets_plugin_t::send_view_to_wset::{lambda(wf::json_t)#1}>::_M_invoke(std::_Any_data const&, wf::json_t&&) ??:?
EE 2025-09-18 03:28:13.616 - #4  std::_Function_handler<wf::json_t (wf::json_t, wf::ipc::client_interface_t*), wf::ipc::method_repository_t::register_method(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::function<wf::json_t (wf::json_t)>)::{lambda(wf::json_t const&, wf::ipc::client_interface_t*)#1}>::_M_invoke(std::_Any_data const&, wf::json_t&&, wf::ipc::client_interface_t*&&) ??:?
EE 2025-09-18 03:28:13.623 - #5  wf::ipc::method_repository_t::call_method(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, wf::json_t, wf::ipc::client_interface_t*) ??:?
EE 2025-09-18 03:28:13.629 - #6  wf::ipc::server_t::handle_incoming_message(wf::ipc::client_t*, wf::json_t) ??:?
EE 2025-09-18 03:28:13.636 - #7  wf::ipc::client_t::handle_fd_incoming(unsigned int) ??:?
EE 2025-09-18 03:28:13.642 - #8  wl_loop_handle_ipc_client_fd_event(int, unsigned int, void*) ??:?
EE 2025-09-18 03:28:13.648 - #9  wl_event_loop_dispatch ??:?
EE 2025-09-18 03:28:13.655 - #10 wl_display_run ??:?
EE 2025-09-18 03:28:13.665 - #11 main ??:?
EE 2025-09-18 03:28:13.672 - #12 __libc_init_first ??:?
EE 2025-09-18 03:28:13.680 - #13 __libc_start_main ??:?
EE 2025-09-18 03:28:13.690 - #14 _start ??:?
(EE) failed to write to Xwayland fd: Broken pipe

Wayfire version
0.11.0-a0e2b4f4 (Sep 17 2025) branch fix-scale-refocus wlroots-0.19.0

Start with wsets.cpp and the waypanel fuzz-testing scenario, focusing on send_window_to in the stack trace. Reproduce the crash using the reported Wayfire version and inspect the Cannot set different output for a view with a parent assertion. Done means the scenario no longer crashes Wayfire.