General issue Go. Why isn't the following code recognized as a source in a global data stream?

Bắt đầu bằng cách so sánh luồng source trong router.go, controller.go, validator.go và param.go với ActiveThreatModelSource mặc định trong TainterPath.ql. Tái hiện sự khác biệt giữa Quick Evaluation và TaintTracking::Global, sau đó kiểm tra query GinContextGetSource tùy chỉnh cùng các tham chiếu của nó đến val.Get, req và c. Hoàn thành khi source dự kiến được nhận diện trong luồng dữ liệu toàn cục.

Why isn't the following code recognized as a source in a global data stream? If I want to identify this source in the global data stream, how should I write my QL?

Here's the code context：

//router.go
func RegisterServers(group *gin.RouterGroup) {
	group.POST("/abc/test", val.Validate[*param.TestParam], controller.TestReadFile)
}

//controller.go
func TestReadFile(c *gin.Context) {
	req := val.Get[*param.TestParam](c)
	cleanPath := req.Path
	file, err := os.Open(cleanPath)
	if err != nil {
		if os.IsNotExist(err) {
			c.JSON(http.StatusNotFound, gin.H{"error": "file not found"})
		} else {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to open file"})
		}
		return
	}
......
}

//validator.go
package val
func Validate[T any](ctx *gin.Context) {
	var req T
	if err := ctx.ShouldBindJSON(&req); err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"code": constant.UnknownErrorCode, "msg": util.GetErrorText(constant.UnknownErrorCode)})
		ctx.Abort()
		return
	}
	ctx.Set("params", req)
	ctx.Next()
}

func Get[T any](ctx *gin.Context) T {
	return ctx.MustGet("params").(T)
}

//param.go
package param

type TestParam struct {
	Path string `json:"filepath"`
}

I found that the default "ActiveThreatModelSource" in the official rule "TainterPath.ql" is not recognizable as a source by the above code.
Here's the code I wrote to try to add a new class about this kind of source, and I use "req" from "req.Path" as the source, although the result can be recognized when "Quick Evaluation" is used, but when it is run in the whole "TaintTracking::Global", it cannot be recognized that there is a problem with this "controller.go".

class GinContextGetSource extends DataFlow::Node {
  GinContextGetSource() {
    exists(Function asmGet, CallExpr call |
    asmGet.hasQualifiedName("project/router/val", "Get")
    and call.getTarget() =  asmGet
    and call.getEnclosingFunction() = this.asExpr().getEnclosingFunction()
    and this.asExpr().toString() = "req"
    and this.asExpr().getEnclosingFunction().getAParameter().toString() = "c"
    )
  }
}

I need to address this issue urgently. Because the routing and controller parts of the entire Gin project that I am currently responsible for are developed in this form, the global data flow in each of my official rules cannot be identified in any of the sources
Thank you so much!