Signature Image Not Displayed in ng2-pdf-viewer

[SeriousSeal]

Versions
Angular: 15.1.3
ng2-pdf-viewer: 9.1.0

Context
We are adding signatures to our PDFs by embedding a signed image into a text field using pdf-lib.

Problem Description
Although we successfully set the image in the text field, ng2-pdf-viewer does not display it. However, when we retrieve the PDF data using:

this.pdfViewer.pdfViewer.pdfDocument.getData()

and download it as a blob, the signature image appears correctly when opened in an external viewer.
code to signthe pdf:

  async signPdf(signUrl: string, pdfDoc: PDFDocument): Promise<Uint8Array> {
    const signImageBytes = await fetch(signUrl).then(res => res.arrayBuffer());
    const form = pdfDoc.getForm();
    const signImage = await pdfDoc.embedPng(signImageBytes);
    const fields = form.getFields();
    fields
      .filter(field => field.getName().startsWith('signature'))
      .forEach(field => {
        const signField = form.getTextField(field.getName());
        signField.setImage(signImage);
      }
      );
    return await pdfDoc.save();
  }

<-- this returns a Promise of Uint8Array

gets called like this:
this.reportDataUInt8 = await this.careSignService.signPdf(event.dataUrl, this.pdfDoc);

the correct file gets created like this:

   const data = await this.pdfViewer.pdfViewer.pdfDocument.getData();
    return { attachment: this.model, content: new Blob([data], { type: 'application/pdf' }) } as DocumentAttachmentWithContent;

Are we doing something wrong or is this a bug of ng2-pdf-viewer?

[stale]

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