[SalesForce] Uncaught (in promise) TypeError: Cannot read property ‘Symbol(ViewModel)’ of undefined

In the custom data table implementation code (i.e., the component that extends LightningDatatable/ in your case test_InvoicesCustomDatatable), a reference should be provided to either another custom component or an HTML file. This custom component or HTML file is the one that defines the custom cell structure (& related code) to be used in the custom data table.

Case 1: If the custom cell displays static content and doesn't implement any custom user interaction, then define a custom HTML file and place it within the custom data table component directory [i.e., test_InvoicesCustomDatatable will have test_InvoicesCustomDatatable.html as well as another HTML file (say customCellContent.html) that defines cell content]. Now, in the component JS file, you can import HTML file using the code import customCellContent from './customCellContent.html' and use this import to define the custom data types. Sample code as shown below:

static customTypes = {
    customDataType: {
        template: customCellContent,
        standardCellLayout: true,
        // Provide template data here if needed
        typeAttributes: ['attrA', 'attrB'] // Define custom attributes, if needed
    }
};

Case 2: If the custom cell has complex structure or implements custom user interactions (such as buttons etc.), then create a new LWC component (say myCustomCellComp) and place all the cell related HTML/ code logic in the same. Now, create a HTML file (customCellContent.HTML) within the custom datatable component directory (similar to previous case) and place the following code in it : <template><c-my-custom-cell-comp></c-my-custom-cell-comp></template>. This HTML file will serve as a conduit between the cell component and the datatable component. Importing the HTML reference and defining custom data type in the JS file will remain the same as previous case.

So, depending on the requirement, you might need to create either 2 or 1 lightning web components and any consumer lwc can make use of the custom data table component. For more details, refer SF official documentation.

I've reproduced your code in a simplified snippet and it does work for me. I think your error may be happening because what @Nick Cook said in a comment - As @wire tracks the property already, so you don't need to @track it. Here you have the simplified code for reference:

import { LightningElement, wire, api } from "lwc";
import { getObjectInfo } from "lightning/uiObjectInfoApi";
import ACCOUNT_OBJECT from "@salesforce/schema/Account";

export default class RecordTypesError extends LightningElement {
  @api recordId;
  @api objectApiName;

  @wire(getObjectInfo, { objectApiName: ACCOUNT_OBJECT })
  objectInfo;

  get recordTypeId() {
    if (this.objectInfo.data) {
      if (this.objectInfo.data.recordTypeInfos) {
        const rtis = this.objectInfo.data.recordTypeInfos;
        return Object.keys(rtis).find((rti) => rtis[rti].name === "test");
      }
    }
    return null;
  }