*Andrea Giudiceandrea*
/Mon Jan 30 10:02:47 PST 2023/
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it seems to me there is no issue using the Field Calculator algorithm in
the Model designer to calculate the area of polygon geometries, at least
using the latest QGIS 3.28 and 3.22 versions.
*Alexandre Neto*
/Mon Jan 30 13:55:11 PST 2023/
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If I remember well, you need to  change the parameter type from value to
precalculated value. If not, try adding single quotes around the expression.

I've also used the Field Calculator algorithm in the Model designer to calculate the area of polygon geometries with QGIS 3.10 without any issue and without the need to change the parameter type to "precalculated value" nor to add single quotes around the expression.

Best regards.

Andrea Giudiceandrea
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