ICoreWebView2DownloadStartingEventHandler Is Fired after the Save PDF Button

Description
I have added a DownloadStarting callback to the ICoreWebView2_4 , on most download this callback is called before the Save dialog appears however is you navigate to a pdf and press the download button in the top right of the PDV viewer the a "Save As" Dialog appears before the callback is called. Clicking cancel or save on the dialog closes the dialog and the callback is called/ fired. I am trying to implement my own dialog boxes for the save which cannot be done currently when saving the pdf.

Version
SDK: 1.0.1108.44
Runtime: 99.0.4844.51
Framework: WIn32
OS: WIn10

Repro Steps
Add a DownloadStarting callback to a ICoreWebView2_4 interface and place a breakpoint on the start of the callback. Download a normal file and notice that the callback is fired before the dialog appears. Navigate to a pdf and click the Save button and notice the Dialog appears before the callback is fired.

AB#38468943

Start by reproducing the PDF viewer Save-button flow with ICoreWebView2_4 and a DownloadStarting callback, comparing its timing with a normal download. The issue is done when the callback is invoked before the Save As dialog appears, allowing a custom save dialog to be used for PDF downloads.