Reader Version 2021.11.20039 64-bit only showing comments on page

I, and my co-workers, possibly since the latest update, have been unable to view certain PDF pages properly, in that only the comments on the page will show, and none of the original PDF.

We have found that, if we open said PDF in a browser, it displays properly.  Then, rather curiously, if we save that PDF from the browser, that version will then display correctly when opened in Acrobat Reader.
I have tried various settings, though not exhaustively, but none of them will open that first annotated PDF and display it properly. 

I have attached an image of what we see, and one of what we should see.
Hopefully someone can help with this.

TIA