Validate required inputs are set before invoking an action

Describe the bug

I have the following action.yml:

name: 'Anka Prepare VM and execute inside'
description: 'Prepare an Anka VM and execute commands inside'
author: Veertu
branding:
  icon: 'anchor'
  color: 'blue'
inputs:
  anka-template:
    description: 'name or UUID of Anka Template'
    required: true

My index.js looks like:

const core = require('@actions/core');
const io = require('@actions/io');
const prepare = require('./prepare');
const execute = require('./execute');

// most @actions toolkit packages have async methods
async function run() {
  try { 
    const ankaVirtCLIPath = await io.which('anka', true)
    console.log(`Anka Virtualization CLI found at: ${ankaVirtCLIPath}`)
    const ankaTemplate = core.getInput('anka-template');
    const ankaTag = core.getInput('anka-tag');
    const ankaCommands = core.getInput('commands');
    const hostPreCommands = core.getInput('host-pre-commands');
    const hostPostCommands = core.getInput('host-post-commands');
    console.log("=========================" + "\n" + `${hostPreCommands}` + "\n" + "=================================")
    console.log("=========================" + "\n" + `${hostPostCommands}` + "\n" + "=================================")
    console.log("=========================" + "\n" + `${ankaCommands}` + "\n" + "=================================")
    if (hostPreCommands) {
      await execute.nodeCommands(hostPreCommands)
    }
    // Prepare VM
    await prepare.ankaRegistryPull(ankaTemplate,ankaTag)
    // Run commands inside VM
    // Cleanup
    if (hostPostCommands) {
      await execute.nodeCommands(hostPostCommands)
    }
  } catch (error) {
    core.setFailed(error);
  }
}

run()

and finally, the important part of my .github/workflows/test.yml:

    - name: basic commands
      id: basic
      uses: ./
      with:
        commands: |
          env
          ls -laht ./
          ls -laht ../
          pwd
          echo "HERE" && \
          echo "THERE HERE WHERE"

Yet, there is no failure for missing anka-template... It fails for a reason inside of the ankaRegistryPull function which is well after it tries to load the input.

https://help.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#inputs seems to indicate that it shouldn't allow the action to run if it's missing that input.

What am I missing?

Reproduce the behavior with the shown action.yml, index.js, and .github/workflows/test.yml, where anka-template is required but omitted. Start by tracing how required inputs are handled before index.js invokes ankaRegistryPull; done means the missing input is rejected at the expected point and the behavior is covered by a test.