setting radio default value on form builder not working, but on resource its working

Fieldset::make('Kategori Permohonan')
            ->schema([
                Radio::make('kategori')
                  ->label('')
                  ->reactive()
                  ->options([
                      'Perorangan' => 'Perorangan',
                      'Lembaga / Organisasi' => 'Lembaga / Organisasi',
                  ])
                  ->required()
                  ->columnSpan('full')
                  ->inline()
                  ->default('Perorangan'),
            ])

Fieldset::make('Kategori Permohonan')
            ->schema([
                Radio::make('kategori')
                  ->label('')
                  ->reactive()
                  ->options([
                      'Perorangan' => 'Perorangan',
                      'Lembaga / Organisasi' => 'Lembaga / Organisasi',
                  ])
                  ->required()
                  ->columnSpan('full')
                  ->inline()
                  ->default('Perorangan'),
            ])