Hello
Someone created a diagram from a group of items in a Miro board. Now I can see that menu instead of my usual frame title, leading to several usage/support problems:

Problem: I cannot find the way to delete this diagram frame.
When trying to do it by simply selecting the diagram frame (around the group of items)>clicking on the three dots>"Delete, I get the error "You can't delete parent node, when child nodes are in editing mode”.
There is no “node” configured per se. Just someone that misclicked on the “create a diagram” button on the grouped items.
People are using the Miro board at the time I am trying, but others parts of it, not the grouped items concerned here by the diagram.
How can I delete this diagram thing now?
I cannot ask the diagram creator to just CTRL+Z as it has been some time and many changes/actions have been done since then then.
Thank you in advance for your help