[Resolved] Translating Custom Gutenberg Blocks

I've built several custom, static Gutenberg blocks. Most of them follow the same structure: a dedicated title field plus InnerBlocks for the content. Here’s one example:

The block.json defines attributes like the media fields, title, and optional icon.
{
"$schema": "hidden link;,
"apiVersion": 3,
"name": "palllm/text-image-item",
"version": "0.1.0",
"title": "Text Image Item",
"category": "layout",
"parent": "palllm/text-image",
"icon": "admin-generic",
"example": {},
"supports": {
"html": false,
"anchor": true,
"align": ["full"]
},
"attributes": {
"mediaId": {"type":"number","default":0},
"mediaUrl": {
"type":"string",
"default":"",
"source":"attribute",
"selector":".text-image__img",
"attribute":"src"
},
"mediaAlt": {
"type":"string",
"default":"",
"source":"attribute",
"selector":".text-image__img",
"attribute":"alt"
},
"title": {
"type":"string",
"default":"Section Title"
},
"iconEnabled": {"type":"boolean","default":false},
"iconId": {"type":"number","default":0},
"iconUrl": {
"type":"string",
"default":""
},
"iconAlt": {
"type":"string",
"default":""
}
},
"textdomain": "theme_textdomain",
"editorScript": "file:./index.js",
"editorStyle": "file:./index.css"
}

save.js
import {useBlockProps, RichText, InnerBlocks} from '@wordpress/block-editor';

export default function save({attributes}) {
const {title, mediaUrl, mediaAlt, iconEnabled, iconUrl, iconAlt} = attributes;

const defaultImageUrl = 'https://cdn.wpml.org/wp-content/themes/palllm/img/preview/front-view-plant-growing-from-pellets.webp';
const displayUrl = mediaUrl || defaultImageUrl;
const wrapperClasses = ['container'];

const mediaEl = (

);

const iconEl = (() => {
if (!iconEnabled) {
return null;
}

if (!iconUrl) {
return null;
}

return (

);
})();

return (

{mediaEl}

{iconEl && (

{iconEl}

)}

);
}

In save.js, everything renders correctly — except for one thing:

gets translated on the frontend exactly as expected, but the title rendered via
refuses to translate. It stays in German, even though the editor detects and translates it without any issues.

In the first screenshot you can see that it's correctly translated in the editor. In the 2nd screen you can see that only the paragraph is translated.

I've tried via wpml-config.xml. But didn't help: