opam repository set-url --strict does not fail on errors

[kit-ty-kate]

$ opam repository set-url --strict default "git://github.com/GgnDpSngh/opam-repository.git#ef9a4b1448581b3de004c85ce9409eaacee2bdd0"
[default] Initialised
[ERROR] In /home/opam/.opam/repo/default/packages/elina/elina.1.1/opam:
        This file is for package 'elina.1.1' but has mismatching fields 'version:1.3.
[ERROR] Strict mode: aborting
[ERROR] Could not update repository "default": OpamStd.OpamSys.Exit(30)
$ echo $?
0

This should return a non-zero exit code and fail, but it succeeds.