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@AlessandroFaniuolo There are no console errors. This works for me also if I try this with one of the xml action editor dialogs. But I am using the xaml based dialog which starts with something like this: <xamlControls xmlns:x="sitecore.net/xaml">
Hi @Mark, Do you mean /sitecore/system/Field types/List Types/QueryableTreelist in core database? If yes, I already have it. I guess this is mandatory to have.
I think this question is already covered in the answer to your last question. Didn't these blogs helped:kbdocssitecore.wordpress.com/2020/03/19/…. I have added an answer to your comment in the post there. I hope it helps.
It seems that you have only uploaded the lucene index config from CD which is pointing towards web db. And that looks fine. Can you please upload the lucene config from CM which points to master db?