I am simply trying to insert a web part to a page.

I ended up with this code:

using (_clientContext = new ClientContext(Url)) {     _clientContext.Credentials = _credentials;     var web = _clientContext.Web;      var file = web.GetFileByServerRelativeUrl("/sites/test5/SitePages/Home.aspx");      var limitedWebPartManager = file.GetLimitedWebPartManager(PersonalizationScope.Shared);     var webPartDefinitions = limitedWebPartManager.WebParts;      _clientContext.Load(webPartDefinitions);     _clientContext.Load(limitedWebPartManager);      _clientContext.ExecuteQuery();      var webPartDefinition = limitedWebPartManager.ImportWebPart(_scriptEditorXml);     var o = limitedWebPartManager.AddWebPart(webPartDefinition.WebPart, "wpz", 0);     _clientContext.Load(webPartDefinition);     _clientContext.Load(o);      _clientContext.ExecuteQuery();  } 

But I can’t see the web part on the page (it’s a script editor).

However, when running this in the same context:

    foreach (var webpartDefinition in limitedWebPartManager.WebParts)     {         _clientContext.Load(webpartDefinition);         _clientContext.Load(webpartDefinition, w => w.ZoneId);         _clientContext.Load(webpartDefinition.WebPart);         _clientContext.ExecuteQuery();          Console.WriteLine($  "{webpartDefinition.WebPart.ZoneIndex} - {webpartDefinition.ZoneId} - {webpartDefinition.WebPart.Title}");     } 

I can see all the web parts that I tried adding – so it seems they do exist somewhere, but they are not visible on the page at all. Output:

2 - wpz - Shared Calendar 1 - wpz - GroupTasks 3 - wpz - Recently Changed Items 2 - WebPartctl00_ctl33_g_c5595a9d_1cba_458d_9cc5_d06729f78715 - Script Editor 1 - WebPartctl00_ctl33_g_c5595a9d_1cba_458d_9cc5_d06729f78715 - Script Editor 0 - WebPartctl00_ctl33_g_c5595a9d_1cba_458d_9cc5_d06729f78715 - Script Editor 0 - WebPartWPQ3 - Script Editor 0 - MSOZoneCell_WebPartWPQ3 - Script Editor 0 - wpz - Script Editor 

What is going on here?