Download of Safari-created pedigree PNG image fails

Steps to replicate: 1) In Safari, create a patient record and click Draw Pedigree in the Family History and Pedigree field. Draw a pedigree, save it, and save the record. When viewing the patient record, click the download button next to the pedigree and select "Image (PNG)" (see attached screenshot for details.)

Expected behaviour: a png image of the pedigree is loaded in a new tab.

Actual behaviour: If the pedigree was created in Safari, then the PNG image of the pedigree will always fail to load, regardless of whether it is opened in Safari or Chrome.