Problem with RTD registration when inserting formula from JavaScript add-in

From: https://stackoverflow.com/questions/64313978/excel-crash-while-trying-to-insert-vsto-addin-formula-from-office-js-taskpane

I am facing an odd issue while connecting VSTO _(Excel-DNA?)_ addin formula with office js taskpane. Below is the scenario

There is one VSTO _(Excel-DNA?)_ addin which has several formulas defined in it.
One newly created office js taskpnae has included as new product and we are trying to use existing formula from the VSTO _(Excel-DNA?)_ addin.
But while inserting any formula from office js to sheet excel is getting crashed. we are returning values from the formula as below

```
return ExcelAsyncUtil.Observe( "ABC", new object[] { parameters }, () => Methoddetails).ToExcelObservable());
```

We can see the log as below also
> 2020-10-10 07:26:36.5178 [ERROR] [T:1] - The RTD server of type ExcelDna.Integration.Rtd.ExcelObserverRtdServer required by add-in addinname could not be registered. This is an unexpected error. Error message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.