I have a block of code that updates the partner_shipping_id based on a value that is input from an api.  Since upgrading to v16 this is no longer working.

        for order in orders:
            _logger.warning("delivery: %s", delivery_partner\.id\)
\ \ \ \ \ \ \ \ \ \ \ \ _logger\.warning\("buyer:\ %s",\ user\.partner_id\.id\)
\	​\	​\ \ _logger\.warning\("order\ %s",\ order\)
\	​\	​\ \ _logger\.warning\("pre\ %s",\ order\.partner_shipping_id\)
\	​\	​\ \ order\.update\(\{
\	​\	​\	​'partner_shipping_id'\ :\ delivery_partner\.id,
\	​\	​\	​'partner_id'\ :\ user.partner_id.id,
                'client_order_ref'    : cid
            })
            _logger.warning("post %s", order.partner_shipping_id)

The log output:

delivery: 32551
buyer: 29618
order sale.order(66452,)
pre res.partner(29618,)
post res.partner(29618,)

I would have expected the post to be the same as the delivery id.  Any suggestions on what is preventing the update from occurring?