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'Symbols are not allowed inside Collection Lists' error for non-symbol

I’m routinely having issues with getting the error ‘Symbols are not allowed inside Collection Lists.’ when dealing with elements that are not symbols. I will try to move elements outside a collection in, and I get the get the error. I will also get the error when duplicating a div already in the collection– it’s very strange and inconsistent.

Any help would be greatly appreciated. Thanks,

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