insomnia: PDF preview does not render text

• Insomnia Version: 6.5.3
• Operating System: Ubuntu 18.10

Details

When an endpoint returns a PDF the preview does not render any text.

This is from Insomnia

This is the PDF saved using the Save response body option.

This PDF was generated from PHP using FPDF and this code

$pdf->SetDrawColor(0, 0, 112);
$pdf->SetFillColor(0, 0, 112);
$pdf->RoundedRect(5, 5, 200, 5, 2, "DF", "12");
$pdf->SetFont("arial", "b", 9);
$pdf->SetTextColor(255);
$pdf->Text(6.5, 8.5, "Such text, very missing, wow");

RoundedRect here is a function we added but the same thing happens when using Rect.