How do I add a custom endpoint to the home page in WordPress?

In WordPress it’s possible to add a custom endpoint to pages, such as: https://example.com/example/test where test is the custom endpoint.

function myEndpoint_init() {
  $myEndpoint = "test";
  add_rewrite_endpoint( $myEndpoint , EP_ALL );
}
add_action( 'init', 'myEndpoint_init',11);

If you then hook into template_redirect you can detect if there’s an endpoint and do something custom accordingly… such as:

function myCustomCode()
{
  //do stuff
  echo "the page id: " . get_the_ID();
}
add_action('template_redirect', 'myCustomCode');

This works great on every page, except for the home page, which doesn’t work as expected.

Example output for https://example.com/example/test: the page id: 57 (this is correct)

For https://example.com/example/: the page id: 57 (this is correct)

For https://example.com/: the page id: 5 (this is correct)

For https://example.com/test the page id: 1 (this is not correct)

And it also does not print the correct page.

What am I missing? How would I achieve this?