Unable to use Fieldsets in Block

[Tom-revere]

Description

I am trying to create Fieldsets within a block using Form Builder, however they never render in the CMS.

Steps to reproduce

Create a new block
Replace the getForm function with the below

public function getForm(): Form
{        
    $form = Form::make();

    $form->add(Input::make()->name('title'));
    
    $form->withFieldSets(new Fieldsets([
        Fieldset::make()->title('Fieldset 1')->id('fieldset1')->fields([
            Input::make()
            ->name('fs1_content')
            ->label(twillTrans('FS 1 Content'))
        ]),
        Fieldset::make()->title('Fieldset 2')->id('fieldset2')->fields([
            Wysiwyg::make()
                ->name('fs2_content')
                ->label(twillTrans('FS 2 Content'))
            
        ])
    ]));

    $form->add(Input::make()->name('description'));

    return $form;
}

Expected result

It should show Fieldsets between Title and Description.

Actual result

It does not show any fieldsets, or the fields within these. Only Title and Description show.

Versions

Twill 3.2.0
Laravel 9.5.2
PHP 8.0.11
MySQL 5.7.33