t2400 on freebsd12

CI for an i18n PR [1] is failing on freebsd12, but I cannot reproduce it. Is this known (a search of archives and the master branch doesn't reveal anything)?

Summary output:

Test Summary Report
-------------------
t2400-worktree-add.sh                            (Wstat: 256 Tests:
227 Failed: 27)
  Failed tests:  50-52, 91-93, 107-109, 123-125, 139-141
                159-161, 175-177, 191-193, 207-209
  Non-zero exit status: 1

Proximate log entry:

[16:19:43] t2400-worktree-add.sh .............................. Dubious, test returned 1 (wstat 256, 0x100) Failed 27/227 subtests

I can see no mention of git-bundle in these tests, so I don't think my PR is responsible for the breakage. I don't have a system on which to bisect, however.