Downloaded Invoice activity attaches non wkhtmltopdf invoice
When using wkhtmltopdf as the PDF engine, the invoices are emailed / printed correctly.
However, when an invoice is downloaded, it creates an activity against the contact with a copy of the invoice attached to the activity. This invoice appears to not use the wkhtmltopdf engine, so the copy displays wrong.
When I turned off wkhtmltopdf, the invoice then appears the same. Bug appears to be downloaded invoice activity isn't using the wkhtmltopdf engine when specified.