Checking zone transfer information in the statistics channel fails on OpenBSD

Job #3693319 failed for 23b52fb6.

There's a permanent test failure in the statschannel system test on OpenBSD on main after e92d1eea got merged, specifically the Checking zone transfer information in the statistics channel check (that worked before the change) and the Checking zone transfer transports check (that was added in the change).

2023-10-03 00:23:55 INFO:statschannel     I:statschannel_tmp_2s8p6u20:Checking zone transfer information in the statistics channel (25)
2023-10-03 00:23:55 INFO:statschannel     I:statschannel_tmp_2s8p6u20:... using xml
2023-10-03 00:23:56 INFO:statschannel     I:statschannel_tmp_2s8p6u20:... using json
...
2023-10-03 00:25:28 INFO:statschannel     I:statschannel_tmp_2s8p6u20:... using xml
2023-10-03 00:25:28 INFO:statschannel     I:statschannel_tmp_2s8p6u20:... using json
2023-10-03 00:25:28 INFO:statschannel     I:statschannel_tmp_2s8p6u20:failed

2023-10-03 00:25:28 INFO:statschannel     I:statschannel_tmp_2s8p6u20:Checking zone transfer transports (26)
2023-10-03 00:25:28 INFO:statschannel     cmp: EOF on xfrins.example.format26
2023-10-03 00:25:28 INFO:statschannel     cmp: EOF on xfrins.example-tcp.format26
2023-10-03 00:25:28 INFO:statschannel     cmp: EOF on xfrins.example-tls.format26
2023-10-03 00:25:28 INFO:statschannel     I:statschannel_tmp_2s8p6u20:failed

xfrins.xml.x25

xfrins.json.j26

xfrins.json.j25