Bind unexpected crash - XoT

(Ref: SF#00001505) A Support customer has reported a crash on 9.18.18-9.18.20 on secondary auth servers:

11-Dec-2023 13:32:26.203 general: debug 1: zone_needdump: zone [redacted]/IN: enter
11-Dec-2023 13:32:26.203 general: debug 1: zone_settimer: zone [redacted]/IN: enter
11-Dec-2023 13:32:26.203 general: debug 1: zone_settimer: zone [redacted]/IN: enter
11-Dec-2023 13:32:26.204 general: debug 1: zone_settimer: zone [redacted]/IN: enter
11-Dec-2023 13:32:26.204 general: debug 10: zone_settimer: zone [redacted]/IN: settimer inactive
11-Dec-2023 13:32:26.204 general: debug 1: queue_soa_query: zone [redacted]/IN: enter
11-Dec-2023 13:32:26.205 general: critical: xfrin.c:1564: INSIST(__v > 0) failed, back trace
11-Dec-2023 13:32:26.206 general: critical: 0x23b128 <assertion_failed+0x88> at /usr/local/named/sbin/named
11-Dec-2023 13:32:26.206 general: critical: 0x800303f8a <isc_assertion_failed+0xa> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8004fe5ae <dns_xfrin_attach+0x143e> at /usr/local/named/lib/libdns-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8002f2856 <isc__nm_async_readcb+0xa6> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8002f126d <isc__nm_readcb+0x11d> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8002fd9fd <isc__nm_tlsdns_processbuffer+0x13d> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8002f1988 <isc__nm_process_sock_buffer+0x58> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8002fcdbe <isc__nm_async_tlsdnsshutdown+0x38e> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x8002fdcfd <isc__nm_tlsdns_read_cb+0xbd> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x800bb9aee <uv_signal_stop+0xc9e> at /usr/local/lib/libuv.so.1
11-Dec-2023 13:32:26.206 general: critical: 0x800bc0555 <uv_cpu_info+0xd65> at /usr/local/lib/libuv.so.1
11-Dec-2023 13:32:26.206 general: critical: 0x800baf438 <uv_run+0x198> at /usr/local/lib/libuv.so.1
11-Dec-2023 13:32:26.206 general: critical: 0x8002ea9cb <isc__netmgr_create+0x76b> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: 0x800329906 <isc__trampoline_run+0x16> at /usr/local/named/lib/libisc-9.18.20.so
11-Dec-2023 13:32:26.206 general: critical: exiting (due to assertion failure)

This customer is on FreeBSD 13.1, uses XoT, and a custom primary solution of unknown provenance. Config/log/core/named binary are on workroom.isc.org:/home/support/SF1505-[redacted]

Libraries have also been requested from the customer, but we have not yet received those.