Can not save post with specific block

Hello,

I have the same problem as https://www.ads-software.com/support/topic/custom-blocks-page-not-saving-edits/ and hope to be able to provide some more information for analysis.

So: as soon as I use a certain block in a post, I can no longer save the post. If I switch to the code editor in the block editor, it works.

The block uses a custom template. I have emptied it completely as a test, but it doesn’t change anything.

I have already ruled out all other plugins as the cause. WordPress is up to date.

Here is the export of the block in question:

[
    {
        "id": 2498,
        "title": "Team Members",
        "icon": "<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\"><path d=\"M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z\" \/><\/svg>",
        "keywords": [],
        "slug": "lazyblock\/team-members",
        "description": "",
        "category": "widgets",
        "category_label": "widgets",
        "supports": {
            "customClassName": true,
            "anchor": false,
            "html": false,
            "multiple": true,
            "inserter": true,
            "reusable": true,
            "lock": true,
            "align": [
                "wide",
                "full"
            ],
            "ghostkit": {
                "effects": false,
                "position": false,
                "spacings": false,
                "frame": false,
                "transform": false,
                "customCSS": false,
                "display": false,
                "attributes": false
            }
        },
        "controls": {
            "control_9cb84d41ca": {
                "type": "number",
                "name": "count",
                "default": "3",
                "label": "Anzahl",
                "help": "",
                "child_of": "",
                "placement": "content",
                "width": "100",
                "hide_if_not_selected": "false",
                "required": "true",
                "translate": "false",
                "save_in_meta": "false",
                "save_in_meta_name": "",
                "min": "1",
                "max": "10",
                "step": "1",
                "placeholder": "",
                "characters_limit": ""
            },
            "control_0f5a0b440e": {
                "type": "url",
                "name": "team-url",
                "default": "\/ueber-uns\/team\/",
                "label": "Team-Seite",
                "help": "",
                "child_of": "",
                "placement": "content",
                "width": "100",
                "hide_if_not_selected": "false",
                "required": "true",
                "translate": "false",
                "save_in_meta": "false",
                "save_in_meta_name": "",
                "placeholder": "",
                "characters_limit": ""
            }
        },
        "code": {
            "output_method": "template",
            "editor_html": "",
            "editor_callback": "",
            "editor_css": "",
            "frontend_html": "",
            "frontend_callback": "",
            "frontend_css": "",
            "show_preview": "always",
            "single_output": false
        },
        "styles": [],
        "condition": []
    }
]

Any ideas?