Safari Big Sur save pdf to memory issue

This works fine in other browsers and versions of Safari before Big Sur. I am saving a pdf as a blob to memory and then referencing it in an object tag. The browser hangs. The pdf isn't shown.
I have a similar report from an end-user that an HTML 5 object element using the URL of a PDF document for the data attribute (rather than a blob) is not rendering correctly. And similarly, this occurs only with Safari on Big Sur (Safari 14.x on Catalina is reported to work, as do other browsers on both macOS and other OSes).

Here's an approximate example:

Code Block
<object
alt="example.pdf"
id="doc-abc-123"
class="document"
data="54f8c35144ac52674ac7fdeac90b4c24.pdf"
role="document"
title="example.pdf"
type="application/pdf"
></object>

Safari Big Sur save pdf to memory issue
 
 
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