extraViewData blade variables in table_view.blade.php not defined

[eelco2k]

FilamentExportBulkAction::make(__('Export'))
                ->extraViewData(function ($action) {
                    return [
                        'recordCount' => $action->getRecords()->count()
                    ];
                }),

gives error:

Undefined variable $recordCount

when using this blade variable in table_view.blade.php as defined in readme.md

{{ $recordCount }}

but it works in pdf.blade.php

[kirchevsky]

The same issue.