The reason why sed:multi_test testcase # 75 fails in 11-CURRENT runs is that the kyua tap tester doesn't fully support the TAP protocol ("not OK # TODO" should pass).
This is being filed as a reference to the upstream bug: https://github.com/jmmv/kyua/issues/85
Addressed upstream in commit 2d47e82a2450ea5e46b8207d91f7eb32b0c31c59. We can either backport it to the package or wait for kyua-testers-0.3.
This is resolved with the latest version of Kyua. Marking RESOLVED FIXED.