InvalidMatrixParameterTypes for param which is not part of matrix

[pritidesai]

#7064 (comment)

The example pipelineRun fails with:

     status:
          completionTime: "2023-08-24T05:03:18Z"
          conditions:
          - lastTransitionTime: "2023-08-24T05:03:18Z"
            message: parameters of type array only are allowed, but param "browser" has type
              "string" in pipelineTask "matrix-and-params"
            reason: InvalidMatrixParameterTypes
            status: "False"
            type: Succeeded

The pipelineTask matrix-and-params does not have a param named browser as part of the matrix. Why is browser listed as a matrix param 🤔

pipeline/examples/v1/pipelineruns/alpha/pipelinerun-with-matrix.yaml

Lines 42 to 54 in ed441e7

	- name: matrix-and-params
	matrix:
	params:
	- name: platform
	value:
	- linux
	- mac
	- windows
	params:
	- name: browser
	value: chrome
	taskRef:
	name: platform-browsers

Running it locally, results in the same corrupted data:

(v1.Params) (len=1 cap=1) {
 (v1.Param) {
  Name: (string) (len=7) "browser",
  Value: (v1.ParamValue) {
   Type: (v1.ParamType) (len=6) "string",
   StringVal: (string) (len=6) "chrome",
   ArrayVal: ([]string) <nil>,
   ObjectVal: (map[string]string) <nil>
  }
 }
}

/kind bug