https://bugs.openldap.org/show_bug.cgi?id=10021
--- Comment #3 from Quanah Gibson-Mount quanah@openldap.org --- (In reply to jailbird from comment #2)
Looking at the blame of the WT repo, it looks like that part of the code is 3 years old, so I don't think it was a change on the WT side. I guess I'll try some bisects.
You might have better luck opening an issue with the people who wrote this code at https://github.com/osstech-jp/openldap/issues