Elasticsearch query has stopped working after 7,7

This was working on 7.6.2 but since upgrading to 7.7 it has stopped working and do not know why?

I am doing a query with a nested or with a nested must so it has to be 5 5 5 or 6 6 6 on three columns.

I am using the laravel scout driver for elastic search babenkoivan/scout-elasticsearch-driver

Thanks :)!

  "query": {
    "bool": {
      "must": [
        {
          "bool": {
            "should": [
              {
                "bool": {
                  "must": [
                    [
                      {
                        "term": {
                          "section": "205"
                        }
                      },
                      {
                        "term": {
                          "profile": "40"
                        }
                      },
                      {
                        "term": {
                          "rim_size": "17"
                        }
                      }
                    ]
                  ]
                }
              }
            ]
          }
        },
        {
          "bool": {
            "should": [
              [
                {
                  "term": {
                    "supplier_id": 3
                  }
                }
              ]
            ]

Error:

{
   "error":{
      "root_cause":[
         {
            "type":"x_content_parse_exception",
            "reason":"[1:106] [bool] failed to parse field [must]"
         }
      ],
      "type":"x_content_parse_exception",
      "reason":"[1:106] [bool] failed to parse field [must]",
      "caused_by":{
         "type":"x_content_parse_exception",
         "reason":"[1:106] [bool] failed to parse field [should]",
         "caused_by":{
            "type":"x_content_parse_exception",
            "reason":"[1:106] [bool] failed to parse field [must]",
            "caused_by":{
               "type":"illegal_state_exception",
               "reason":"expected value but got [START_ARRAY]"
            }
         }
      }
   },
   "status":400
}