Issues with customRowAction

We have a library with a handful of metadata fields, including

• Document Status (vStatus) : Managed Metadata, default value = In Progress
• To Be Checked (vToBeChecked) : Yes/No, default value = No
• Checked (vChecked): Yes/No, default value = No

'To Be Checked' is used to filter a view that only shows items that need checking, it's not visible on the view itself - if Yes, then the document is visible for checking.

When 'Checked' is toggled to Yes, a custom row action is triggered that sets 'Document Status' to Final, and sets 'To Be Checked' to No.

This has been working for the last 3 years, now one user has started receiving an error that 'One or more fields have an error', the error points to the 'Document Status' field as having the problem.  If I remove the line that updates the Status, everything else works as expected.

I've re-created the above fields on a new site and am able to replicate the error

• The Site Owner account, using Edge or Chrome, normal or incognito/private receives the error
• SC Admin using Edge private mode it works
• One normal site Member has the error, another doesn't

Code for 'vChecked' field

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "display": "flex",
    "width": "100%",
    "height": "100%",
    "align-items": "center"
  },
  "children": [
    {
      "elmType": "div",
      "style": {
        "display": "flex",
        "width": "60px",
        "height": "30px",
        "border-radius": "15px",
        "align-items": "center",
        "flex-direction": "row",
        "justify-content": "=if(@currentField , 'flex-end' , 'flex-start')",
        "cursor": "pointer"
      },
      "customRowAction": {
        "action": "setValue",
        "actionInput": {
          "vChecked": "=if(@currentField , '0' , '1' )",
          "vToBeChecked": 0,
          "vStatus": "=if(@currentField,if([$vStatus] == 'Final','Final|{{ GUID }}','In Progress|{{ GUID }}'),'Final|{{ GUID }}')"
        }
      },
      "attributes": {
        "class": "=if(@currentField , 'ms-bgColor-themePrimary' , 'ms-bgColor-neutralTertiaryAlt')"
      },
      "children": [
        {
          "elmType": "div",
          "style": {
            "width": "18px",
            "height": "18px",
            "margin-left": "6px",
            "margin-right": "6px",
            "border-radius": "50%"
          },
          "attributes": {
            "class": "ms-bgColor-white"
          }
        }
      ]
    }
  ]
}

Code for 'vStatus' field

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "@currentField",
  "style": {
    "background-color": "=if(@currentField == 'Final', '#cfe7d8', if(@currentField == 'In Progress', '#fff4cc', if(@currentField == 'Internal Only', '#ccd6ec', '' )))"
  }
}

Code for 'vToBeChecked' field

{
    "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
    "elmType": "div",
    "style": {
        "display": "flex",
        "width": "100%",
        "height": "100%",
        "align-items": "center"
    },
    "children": [
        {
            "elmType": "div",
            "style": {
                "display": "flex",
                "width": "60px",
                "height": "30px",
                "border-radius": "15px",
                "align-items": "center",
                "flex-direction": "row",
                "justify-content": "=if(@currentField , 'flex-end' , 'flex-start')",
                "cursor": "pointer"
            },
            "customRowAction": {
                "action": "setValue",
                "actionInput": {
                    "vToBeChecked": "=if(@currentField,'0','1')",
                    "vChecked": 0
                }
            },
            "attributes": {
                "class": "=if(@currentField , 'ms-bgColor-themePrimary' , 'ms-bgColor-neutralTertiaryAlt')"
            },
            "children": [
                {
                    "elmType": "div",
                    "style": {
                        "width": "18px",
                        "height": "18px",
                        "margin-left": "6px",
                        "margin-right": "6px",
                        "border-radius": "50%"
                    },
                    "attributes": {
                        "class": "ms-bgColor-white"
                    }
                }
            ]
        }
    ]
}

Any ideas would be appreciated.

 - R