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A function in the formula has no closing parenthesis

When trying to  Workbook.Load("file.xlsx") we get

Name Value Type
$exception {"A function in the formula has no closing parenthesis.\r\nPortion with error: WEEKDAY($B12"} Infragistics.Documents.Excel.FormulaParseException

This only happened after upgrading to 18.1 (from an - I think - about six year old version).

If there is no workaround: can we downgrade only the excel library and still use the 18.1 WPF components to fix this?