.Net Core Filter works if query params is passed, otherwise it does not even hit breakpoint

I have added a filter to get data either from query params or from body, but breakpoint on filter is only hit when I have passed query params to method, else not

FilterCode:

public class GroupingCodeFilter : IAsyncActionFilter
    {
        public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            var httpContext = context.HttpContext;
            var request = httpContext.Request;

            if (request.Query.TryGetValue("grouping", out var groupingFromQuery))
            {
                httpContext.Items["grouping"] = groupingFromQuery.ToString();
            }
 
            else if (context.ActionArguments.TryGetValue("model", out var value) &&
                     value is GridParamsModel gridModel &&
                     gridModel.ParameterDictionary != null &&
                     gridModel.ParameterDictionary.TryGetValue("groupingCode", out var groupingCodeObj))
            {
                var groupingCode = groupingCodeObj?.ToString();
                if (!string.IsNullOrEmpty(groupingCode))
                {
                    httpContext.Items["grouping"] = groupingCode;
                }
            }

            await next();
        }
    }

Method on which filter works :

[HttpPost("AddRecord")] 
[GroupingCodeFilter]
[DynamicTask(typeof(TaxCalendarAPIService.Controllers.GridServiceControllers.MaintainPaymentTypesController), "GetDynamicAaddRecordTaskAttributeID", "grouping")] 
public async Task AddRecord([FromQuery] string grouping, [FromBody] CodeListDTO model) {} 

Method on which filter does not work :

[HttpPost("GetContent")]
[GroupingCodeFilter]
[DynamicTask(typeof(...), "GetDynamicTaskAttributeID", "grouping")]
public async Task GetContent([FromBody] GridParamsModel model)
{}

On GetContent Method filter works if I pass queryparams or if I comment DynamicTaskAttribute

I have even tried to register filter in startup and then use it as but nothing worked

[ServiceFilter(typeof(GroupingCodeFilter))]

GetMethod shows error that The give key 'grouping' was not present in the dictionary

Somebody please help. I am just tired of this