sorry for late reply. yes. according to acf6 you now should use register_block_type (instead of acf_register_block_type) and load the block.json file. Example:
{
"name" : "lmdm/tabitem",
"title" : "Tab-Inhalt",
"description" : "Tab-Inhalt",
"category" : "widgets",
"icon" : "<svg width=\"80px\" height=\"80px\" viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\">\n <g id=\"icon-tab-item\" stroke=\"none\" stroke-width=\"1\" fill=\"none\" fill-rule=\"evenodd\">\n <path d=\"M31.0453442,11.6287145 L31.0453442,27 L75,27 L75,75 L5,75 L5,27 L10.2507421,27 L10.2507421,11.6287145 L31.0453442,11.6287145 Z\" id=\"Rectangle\" stroke=\"#000000\" stroke-width=\"4\"></path>\n <rect id=\"Rectangle\" fill=\"#000000\" x=\"13\" y=\"35\" width=\"54\" height=\"32\"></rect>\n </g>\n</svg>",
"keywords" : ["tabs","navi","accordion","accordeon"],
"parent" : ["lmdm/tabgroup"],
"supports" : {
"align" : false,
"align_text" : true,
"multiple" : true,
"color" : {
"background": false
},
"jsx" : true
},
"acf": {
"mode": "preview",
"renderTemplate": "index.php"
}
}
