There looks to be a stale and hidden helper column in the document that has a slow formula in it.
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About helper columns. Helper columns are created in the background for various column types to help store extra information needed. We are unsure on what exactly led to the helper column being created in your document. One possibility: When changing a column type, reloading the page before applying or canceling the column type transformation.
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Finding hidden helper columns via the API.
https://$host/api/docs/$docid/tables/$tableid/columns?hidden=true -
Deleting helper columns via the API Apply this change per helper column
curl -XDELETE -H "Authorization: Bearer $key" -H "Content-Type: application/json" https://$host/api/docs/$docid/tables/$tableid/columns/$columnid