$0 shipping recorded still occuring

I see that the changelog refers to race conditions for recording shipping, and we hadn’t previously had issues but in the past 2 weeks, our client has had 3 orders with this issue.
May 11th, May 13th, May 18th. The plugin was updated to version 9.065 on April 21.

The shipping method and rate are correctly written to the order line items but the order-level shipping_total field is $0.00. Toggling the order status to On Hold forces a recalculation and corrects the total.

The log for the most recent order

the webhook shows

"shipping_lines": [
  {
    "id": 8305,
    "method_title": "UPS SurePost® (USPS) > 1lb",
    "method_id": "wf_shipping_ups",
    "instance_id": "0",
    "total": "17.47",
    "total_tax": "0.00",
    "taxes": [],
    "tax_status": "taxable",
    "meta_data": [
      {
        "key": "_xa_ups_method",
        "value": {
          "id": "wf_shipping_ups:93",
          "method_title": "UPS SurePost® (USPS) > 1lb",
          "items": { "216": "2", "258": "2", "352": "2" }
        }
      }
    ]
  }
]

later in the log for that order, the shipping cost is gone.

[Shortcode #4] Validated/Created customer and created order object
"totals": {
  "subtotal": 31,
  "shipping": "0",
  "tax": "0",
  "total": "31.00"
},
"shipping_methods": [
  { "id": "wf_shipping_ups", "label": "UPS SurePost® (USPS) > 1lb" }
]