Sharepoint export 5000

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I can’t export a view from a SharePoint list as it says it exceeds 5000. However:

No view of this list exceeds 5000.
The largest view exports ok.
I have only one lookup.
I have no calculated fuields.
The three filters on the view in question are all on indexed fields.
There are three filters, less than the working largest list.
The second and third filter are set to OR, same as the largest view.
I’ve tried Chrome and Classic.
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