crt.LoadDataRequest does not seem to trigger?

I am trying to filter a Contact lookup so that it only displays contacts where Type.Name = "Prescriber".

Following this guide https://customerfx.com/article/dynamically-filtering-a-lookup-on-a-crea… I implemented a handler for "crt.LoadDataRequest". See code below:

		handlers: /**SCHEMA_HANDLERS*/[
 
			{
				request: "crt.LoadDataRequest",
				handler: async (request, next) => {
 
					console.log("request.dataSourceName: " + request.dataSourceName);
 
					if(request.dataSourceName !== "PDS_WlfPrescriber_u7mn5e4_List_DS") {
						return await next?.handle(request);
					}
 
					const filter = new sdk.FilterGroup();
					await filter.addSchemaColumnFilterWithParameter(sdk.ComparisonType.Equal, "Type.Name", "Prescriber");
 
					console.log("filter:" + filter);
 
					// note, these lines are only needed due to an issue with filters in Creatio-DevKit SDK
					// expected to be fixed in Creatio 8.1
					const newFilter = Object.assign({}, filter);
					newFilter.items = filter.items;
 
					request.parameters.push({
						type: "filter",
						value: newFilter
					});
 
					console.log("request.parameters:" + request.parameters);
 
					return await next?.handle(request);
				}
			}
 
		]/**SCHEMA_HANDLERS*/,

Unfortunately it does not seem to work. I added a bunch of "console.log" statements, but they are not triggering either.

The weirdest part, is that at some point I was getting the "request.dataSourceName:"  logged in the console, but right now i'm not. I have tried doing a hard refresh + clearing cache in browser, using a private window, etc, to no avail. I don't see any errors in Creatio's javascript editor.

Any thoughts on how to address?