The post_content in the database shows this:
<!-- wp:acf/alert {"id":"block_6322f7e222bc2","name":"acf/alert","data":{"style":"jd-alert-primary","_style":"field_605a25cbfd38d","content":"test","_content":"field_605a25703f166","animation":"0","_animation":"field_605d359101c4c"},"align":"","mode":"preview"} /-->
<!– wp:paragraph –>
<p>lorem ipsum</p>
<!– /wp:paragraph –>
when im logged in the custom alert block is showing when im not logged in only the <p>lorem ipsum</p> is showing.