ACF PRO 5.8.0 Beta4.1 is now available for download 
! This includes all the new awesome features shown in the ACF 5.8 – Introducing ACF Blocks for Gutenberg announcement.
To test ACF PRO 5.8.0-beta4.1, please login to your store account and click the See all versions link alongside your license. Download, extract and replace ‘advanced-custom-fields-pro’ plugin folder contents.
Think you’ve found a bug? Please post in detail a new support ticket.
This new release contains various bug fixes and improvements to the recent 5.8.0-beta4 version. You can view the full changelog is below.
*Release Date - 22 March 2019*
* Fixed 'wp-blocks' JavaScript being enqueued on front end.
* Fixed bug causing bool data to be displayed as string 'false'.
* Fixed align 'center' setting affecting field labels.
* Fixed bug in local meta causing extra DB calls to the wp_options table.
* Fixed bug showing toggle mode button in sidebar when 'mode' setting is disabled.
* Block preview is now updated after switching from edit mode.
* Prevent wp_targeted_link_rel() function from corrupting saved JSON data.
* Improved loading default values in block preview.
* Fixed bug where 'post_types' setting prevents re-usable block edit logic.
* Fixed bug saving <p> tags in tinymce value.
* Added JS filter 'relationship_ajax_data' to customize data sent in query request.
* Added filter 'acf/pre_save_block' to customize the attributes saved in JSON.