How to make `arc land` check local and phabricator review are in sync?

Question

Consider the following workflow:

1. make some changes
2. git add . && git commit -am 'update 1'
3. arc diff, now local and phabricator code review are in sync
4. make some further changes and git commit -a --amend --no-edit
5. arc land and the local amended (unreviewed) changes are happily accepted by Arcanist and gets merged to master.

Apparently, if I don't do --amend in step 4 and create another commit, arc land would fail complaining a mismatch. But I would like to configure Arcanist so that with --amend arc land can fail as well. Is this possible?

Answer 1

It turns out the arc command I am using is monkey patched by my employer and there is a bug in the patch.