SCFG "Kill NetMail After Sent" = "No" still kills netmail after sending.

I've tried the SBBS internal editor, FSEditor and Slyedit all with the same result:

2026-01-20 22:21:18 Created NetMail (2.msg) from Keyop Troy (2:250/3) to fred blogs (2:250/3), attr: 0181 (PRIVATE, KILLSENT, LOCAL), subject: test
2026-01-20 22:24:16 Created NetMail (3.msg) from Keyop Troy (2:250/3) to fred blogs (2:250/3), attr: 0181 (PRIVATE, KILLSENT, LOCAL), subject: test 2

KILLSENT should not be set/used.