StringTagField doesn't load existing value when shouldLazyLoad is true

[micschk]

Following #198 & #199 , I couldn't get StringTagField to render the currently selected value when shouldLazyLoad is true.
This is in an inline elemental block/react & Graphql.
I do see the correct field value being returned via Graphql but the selected tags dont get rendered.
This works OK when shouldLazyLoad is false (which leads me to think this might have something to do with the selected tags not being present in the options array and thus being ignored but I couldn't find out how exactly to fix this).

[GuySartorelli]

This is in an inline elemental block/react & Graphql

To help narrow down the situation, have you tried this scenario outside of the context of elemental blocks?

Update: I have since seen this same behaviour inside a regular model edit form. Saved tags display correctly, but results from the lazyloading don't have any displayed title in the dropdown.

I have tried two different ways to set this up, see StringTags1 and StringTags2 in the below snippet:

use SilverStripe\Forms\FieldList;
use SilverStripe\ORM\DataObject;
use SilverStripe\TagField\StringTagField;
use SilverStripe\TagField\TagField;

class BlogPost extends DataObject
{
    private static string $table_name = 'BlogPost';

    private static array $db = [
        'Title' => 'Varchar(255)',
        'StringTags1' => 'Text',
        'StringTags2' => 'Text',
    ];

    public function getCMSFields(): FieldList
    {
        $fields = parent::getCMSFields();
        $field = TagField::create(
            'StringTags1',
            'String Tags 1',
            BlogTag::get(),
            $this->StringTags1
        )
             ->setShouldLazyLoad(true);
        $field2 = StringTagField::create(
            'StringTags2',
            'String Tags 2',
            BlogTag::get()->column('Title'),
            $this->StringTags2
        )
            ->setShouldLazyLoad(true);
        $fields->addFieldsToTab('Root.Main', [$field, $field2]);
        return $fields;
    }
}

class BlogTag extends DataObject
{
    private static string $table_name = 'BlogTag';

    private static array $db = [
        'Title' => 'Varchar(200)',
    ];

    public function requireDefaultRecords(): void
    {
        parent::requireDefaultRecords();
        $tags = [
            'Lorem Ipsum',
            'Dolor Sit Amet',
            'Consectetur Adipiscing',
            'Elit Sed Do',
            'Eiusmod Tempor',
            'Incididunt Ut Labore',
            'Et Dolore Magna Aliqua',
            'Ut Enim Ad Minim',
        ];
        foreach ($tags as $title) {
            if (!self::get()->filter('Title', $title)->exists()) {
                $tag = self::create();
                $tag->Title = $title;
                $tag->write();
            }
        }
    }
}

[GuySartorelli]

Solutions include:

1. Explicitly disallowing ->setShouldLazyLoad(true) for StringTagField - doesn't fix this but given it probably never worked at least it'll be clearer that this doesn't work. This is the "we won't support it" solution.
2. Allow the syntax for StringTags1 above - i.e. lazy load being true only works if there is a DataList (or arguably a SS_List with appropriate key/value pairs to allow for custom lazy lists).

We shouldn't allow it for arrays because there's no performance benefit to that - but it could definitely be useful for large datasets