'uv_udp_send' reading 16 bytes from a region of size 8 in netmgr/udp.c

When building main with GCC 13.0.0-20220821 snapshot on Fedora 36 with ASAN and LSAN enabled I get the following warning (likely originated in b69e7831):

netmgr/udp.c: In function 'isc__nm_udp_send':
netmgr/udp.c:729:13: warning: 'uv_udp_send' reading 16 bytes from a region of size 8 [-Wstringop-overread]
  729 |         r = uv_udp_send(&uvreq->uv_req.udp_send, &sock->uv_handle.udp,
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  730 |                         &uvreq->uvbuf, 1, sa, udp_send_cb);
      |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
netmgr/udp.c:729:13: note: referencing argument 3 of type 'const uv_buf_t[0]'
In file included from ./include/isc/uv.h:17,
                 from ./include/isc/barrier.h:31,
                 from netmgr/udp.c:17:
/usr/include/uv.h:711:15: note: in a call to function 'uv_udp_send'
  711 | UV_EXTERN int uv_udp_send(uv_udp_send_t* req,
      |               ^~~~~~~~~~~