BranchHandleImpl#isModified can incorrectly indicate that a document is not modified

    private boolean isModified(final DocumentVariant unpublished, final DocumentVariant published) {
        try {
            return unpublished.getLastModified().after(published.getLastModified());
        } catch (RepositoryException e) {
            log.error("Cannot determine if document {} is modified, returning false", unpublished.getIdentity(), e);
            return false;
        }
    }