JSON Formatting forEach with customCardProps not working

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

Windows

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• MS Edge Version 139.0.3405.86 (Offizielles Build) (64-Bit)
• SharePoint Online

Describe the bug / error

When forEach looping through a multi value field the iterator variable, in my case [$Governance], in customCardProperty is null.

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "flex-wrap": "wrap",
    "display": "flex"
  },
  "children": [
    {
      "forEach": "Governance in @currentField",
      "elmType": "div",
      "style": {
        "box-sizing": "border-box",
        "padding": "4px 8px 5px 8px",
        "overflow": "hidden",
        "text-overflow": "ellipsis",
        "display": "flex",
        "border-radius": "16px",
        "height": "24px",
        "align-items": "center",
        "white-space": "nowrap",
        "margin": "4px 4px 4px 4px"
      },
      "attributes": {
        "class": {
          "operator": ":",
          "operands": [
            {
              "operator": "==",
              "operands": [
                "[$Governance]",
                "Auswahl 1"
              ]
            },
            "sp-css-backgroundColor-BgLightGray sp-css-borderColor-LightGrayFont sp-css-color-LightGrayFont",
            {
              "operator": ":",
              "operands": [
                {
                  "operator": "==",
                  "operands": [
                    "[$Governance]",
                    "Auswahl 2"
                  ]
                },
                "sp-css-backgroundColor-BgLightGray sp-css-borderColor-LightGrayFont sp-css-color-LightGrayFont",
                "sp-field-borderAllRegular sp-field-borderAllSolid sp-css-borderColor-neutralSecondary"
              ]
            }
          ]
        }
      },
      "children": [
        {
          "elmType": "span",
          "style": {
            "overflow": "hidden",
            "text-overflow": "ellipsis",
            "padding": "0 3px"
          },
          "txtContent": "[$Governance]",
          "attributes": {
            "class": {
              "operator": ":",
              "operands": [
                {
                  "operator": "==",
                  "operands": [
                    "[$Governance]",
                    "Auswahl 1"
                  ]
                },
                "sp-css-color-LightGrayFont",
                {
                  "operator": ":",
                  "operands": [
                    {
                      "operator": "==",
                      "operands": [
                        "[$Governance]",
                        "Auswahl 2"
                      ]
                    },
                    "sp-css-color-LightGrayFont",
                    ""
                  ]
                }
              ]
            }
          },
          "customCardProps": {
            "formatter": {
              "elmType": "span",
              "txtContent": "[$Governance]"
            },
            "openOnEvent": "hover",
            "directionalHint": "bottomCenter",
            "isBeakVisible": true,
            "beakStyle": {
              "backgroundColor": "white"
            }
          }
        }
      ]
    }
  ]
}

Steps to reproduce

1. Create SharePoint Online List
2. Add Selection Field with multiple values allowed
3. Select 2 values for the field
4. Format column as in the example above

Expected behavior

Each customPropCard should the show the unique value of the selected values in the field.