[Resolved] How to programatically insert translation?

I've managed to dig into the code and found this:

You register the string with the following code:

$package = [
'kind' => "The Translation Package ({$postID})",
'kind_slug' => "the-translation-package-{$postID}",
'post_id' => $postID,
'title' => 'My Package Title',
'name' => 'my-package-name'
];

$stringValue = 'original string; can be anything here';

do_action(
'wpml_register_string',
$stringValue,
'my-string-name',
$package,
'My String Title',
'LINE' // or AREA if it's a multi-line
);

Then you can add the translation as follows:

$string_id = icl_get_string_id($stringValue, "{$package['kind_slug']}-{$package['name']}", 'my-string-name');
icl_add_string_translation($string_id, 'es', 'translation value', ICL_TM_COMPLETE);

This do work, so yay.

However, there are couple of more issues:

1. Although the string translation IS inserted, it doesn't appear to mark the post as translated
2. Although the translation is marked as `ICL_TM_COMPLETE` the UI doesn't seem to reflect this state.