Hey,
I tried to merge 2 lists natively in bubble with the :merged with function. However I came across the issue some other people have as well, being that the duplicate elements were deleted. My plugin “List Merger” has the purpose to bypass that, enabling the merge of 2 lists without the removal of duplicates.
The usage is very simple, just place the element in the app, and add the action associated to that element wherever you want in a workflow. The result will be stored in the element.