I am trying to duplicate this sample for ToC in .net 7 with the latest libraries.
https://playground.jsreport.net/w/admin/tV6sVKbV

var scriptList = new List<Script>();
scriptList.Add(new Script()
{
     Content = @"const jsreport = require('jsreport-proxy') .... --- all content of script from sample ----"
});

HttpContext.JsReportFeature()
    .Recipe(Recipe.ChromePdf)
    .Engine(Engine.Handlebars)
    .Configure((r) =>
        {
            r.Template.Scripts = scriptList;
            r.Template.Helpers = @"
                const jsreport = require('jsreport-proxy')
                const headings = []
------ all content for the helpers -------- --> copied from sample."
});
return View("Toc") // Template from playground

The error message I get is from node:
JsReportBinaryException: Error rendering report: rendering has finished with errors:An error ocurred while trying to execute "render" command (3)(because) a critical error occurred while trying to execute the render command (2)(because) error when evaluating custom script anonymousTemplate must contains _id, name, shortid or content attribute (1)-- error (1) ---> stackError: Error when evaluating custom script anonymousTemplate must contains _id, name, shortid or content attribute at Client.render (C:\snapshot\jsreport\packages\nodejs-client\lib\client.js:92:17) at processTicksAndRejections (node:internal/process/task_queues:96:5) at async startRender (C:\snapshot\jsreport\packages\jsreport-cli\lib\commands\render.js:321:24) at async C:\snapshot\jsreport\packages\jsreport-cli\lib\commands\render.js:228:22 at async executeCommand (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\executeCommand.js:22:20) at async Object.handler (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\registerCommand.js:76:9) at async parseCLI (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:156:3) at async startCLI (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:121:20) at async startCommand (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:67:5) at async startProcessing (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startProcessing.js:195:3)Remote stack: Error: Template must contains _id, name, shortid or content attribute at C:\snapshot\jsreport\packages\jsreport-core\lib\shared\createError.js:10:13 at WorkerReporter.createError (C:\snapshot\jsreport\packages\jsreport-core\lib\shared\reporter.js:49:12) at AsyncFunction.<anonymous> (C:\snapshot\jsreport\packages\jsreport-core\lib\worker\templates.js:14:24) at ListenerCollection.fire (C:\snapshot\jsreport\packages\jsreport-core\lib\shared\listenerCollection.js:157:32) at async beforeRender (C:\snapshot\jsreport\packages\jsreport-core\lib\worker\render\render.js:25:5) at async WorkerReporter._render (C:\snapshot\jsreport\packages\jsreport-core\lib\worker\render\render.js:146:7) at async Object.proxy.render (C:\snapshot\jsreport\packages\jsreport-core\lib\worker\defaultProxyExtend.js:6:17)wrapped by:-- error (2) ---> stackError: at onCriticalError (C:\snapshot\jsreport\packages\jsreport-cli\lib\commands\render.js:304:19) at C:\snapshot\jsreport\packages\jsreport-cli\lib\commands\render.js:258:14 at processTicksAndRejections (node:internal/process/task_queues:96:5) at async executeCommand (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\executeCommand.js:22:20) at async Object.handler (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\registerCommand.js:76:9) at async parseCLI (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:156:3) at async startCLI (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:121:20) at async startCommand (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:67:5) at async startProcessing (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startProcessing.js:195:3)wrapped by:-- error (3) ---> stackError: at startCLI (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:127:19) at processTicksAndRejections (node:internal/process/task_queues:96:5) at async startCommand (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startCommand.js:67:5) at async startProcessing (C:\snapshot\jsreport\packages\jsreport-cli\lib\commander\startProcessing.js:195:3)

Without the script section being set, I get the ToC as expected, but of course Page Numbers are missing (NA is written instead). Anybody has experienced the same? No help if I explicitly set the short id of the Script.

Maybe it's a bug in the Wrapper and the Script Object is not parsed correctly before being passed to the Node.js server?

const finalR = await jsreport.render({
        template: {
            name: req.template.name
        },
        data: {
            ...req.data,
            $pdf: p,
            secondRender: true
        }
    })

This won't work in your case, because you don't persist templates. What you need to do is change the script to pass all template props to the second render.

const finalR = await jsreport.render({
        template: {
            ...req.template
        },
        data: {
            ...req.data,
            $pdf: p,
            secondRender: true
        }
    })

https://playground.jsreport.net/w/anon/ipv~_FZV