PDFTron WebViewer: Set the Comb flag to a text field that appears multiple times

I'm loading a PDF document and I need to be sure that each field whose name has a certain pattern gets converted to a COMB field. Happens that a field can be duplicated, meaning that is possible to find another field with the same.

For each field...

const fieldChanged = await PDFNet.runWithCleanup(() => combFieldAdjustmentCallBack(pdfField, configuredMaxLen), this.configurationService.webViewerPDFTronKey);

combFieldAdjustmentCallBack implementation

      const combFieldAdjustmentCallBack = async (pdfField: Core.Annotations.Forms.Field,          configuredMaxLen: number) => {            let fieldChanged: boolean;            const itr = await pdfDoc.getFieldIterator(pdfField.name);            for (; await itr.hasNext(); await itr.next()) {                const docField = await itr.current();                // if the field has not set the flag comb; set it and mark the field as changed                const comb = await docField.getFlag(PDFNet.Field.Flag.e_comb);                if (!comb) {                    await docField.setFlag(PDFNet.Field.Flag.e_multiline, false);                    await docField.setFlag(PDFNet.Field.Flag.e_password, false);                    await docField.setFlag(PDFNet.Field.Flag.e_no_spellcheck, true);                    await docField.setFlag(PDFNet.Field.Flag.e_no_scroll, true);                    await docField.setFlag(PDFNet.Field.Flag.e_rich_text, false);                    await docField.setFlag(PDFNet.Field.Flag.e_comb, true);                    const comb = await docField.getFlag(PDFNet.Field.Flag.e_comb);                    //  Always "Field XYZ is a comb field: false"                    console.log(`Field ${pdfField.name} is a comb field: ${comb}`);                    fieldChanged = true;                }                // Set max length                const currentMaxLength = await docField.getMaxLen();                if (configuredMaxLen != currentMaxLength) {                    await docField.setMaxLen(configuredMaxLen);                    fieldChanged = true;                }                if (fieldChanged) {                    docField.refreshAppearance();                }                return fieldChanged ?? false;            }        };

This logic works when the field happens only once, but doesn't work when the field repeats across the PDF. Please, note Always "Field XYZ is a comb field: false

What I'm missing