Update all linked smart objects CC2019 script not working in CC2020 and 2021

I didn't go into the script and didn't check,

but try replacing the line

app.runMenuItem(stringIDToTypeID('placedLayerEditContents'));

with this code

var doc0 = app.activeDocument;
app.runMenuItem(stringIDToTypeID('placedLayerEditContents'));
if (doc0 != app.activeDocument) { alert("can't open smart object"); throw("error"); }

And also in the same function replace the line 

app.activeDocument.close(SaveOptions.SAVECHANGES);

with this

app.activeDocument.close(SaveOptions.SAVECHANGES);
app.activeDocument = doc0;

From extendscript i get an error at line 69

autoupdateAllSmartObjects(app.activeDocument, stackNr);  -- no such element