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To reproduce:

1. Add "Defaults        log_output" to /etc/sudoers
2. Login as a user that can "sudo su -"
3. Run "who am i"

Expected result would be a correct output.

I did check sudo hg commits, the problem starts happening
with SUDO_1_8_23 but works correctly with SUDO_1_8_22 or earlier
versions.

The diff is a single 77220 lines patch, but most likely the culprit
is the changes in src/ttyname.c, that are somewhat small, but have
lots of dependencies around to have a full patch.

*** Bug 1689125 has been marked as a duplicate of this bug. ***

This sounds like a bug fixed in sudo 1.8.27.  It was fixed by https://www.sudo.ws/repos/sudo/rev/cf81f3fa1f3a

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2271