I saw, a little bit surprised that the PR was merged already. I tested it today and apart from the lost penny problem that is still here, when there is a tax applied on shipping, it is not displayed at all anymore, not in shipping cost (when displayed with tax), nor in tax total, nor in total cost.

When merging my modification with this new ZC version, problem is identical, which makes me think it is coming from the code change on $tax_add handling in file order.php after line 860.