Hey Jarno,
Did you try deleting the listview and just adding it freshly from the Toolbox menu? I have found this can sometimes resolve these issues.
Alternatively, if you really cannot get the widget to work, you could manually reset the id by using a javascript call on the page. Make sure you add a unique class to your list first, e.g. “target-list-to-fix”. Then the JavaScript code could look something like this.
//get the listview
let targetListview = document.querySelector('.target-list-to-fix');
//get the items in it
let listItems = targetListview.querySelectorAll('li');
//iterate over the items, and use an index (i)
listItems.forEach(function (item, i) {
//set the right id, using the index
item.setAttribute('id', 'mx-name-index-'+i);
});
Hope this will help.
Best regards,
Wouter