Can the "Update Previous Build" setting be used when pushing a change from my local workstation (i.e. not from the Odoo.sh Editor running on the build itself)?

When I make changes from my local PC and push them to my public odoo_addons repository, Odoo.sh detects this as expected.  If the branch is set to New Build, then all is well. If the branch is set to "Update previous build" it rebuilds and is tagged with the correct commit, but the source code on that instance is still the old version.  

Is this expected behaviour?  Is this workflow supported?  

Thank you.