WordPress Gutenberg InnerBlocks renderAppender not showing with template

I have found my typo – It should be

const ALLOWED_BLOCKS = ["grid/item", "core/image"];

not

const ALLOWED_BLOCKS = ["grid/item, core/image"];

If the allowed block type does not exist it only makes sense not to display a button to add more blocks 😀

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)