NVDA does not read Formula tags in PDF #12715

Steps to reproduce:

1. Open the attached PDF (I used Adobe Acrobat Pro DC)
2. Read the document

Actual behavior:

NVDA reads "Heading level one" and then the text followed by "here is a formula" (the text in the paragraph tag after the H1.
And then NVDA stops reading. The Formula tag is not announced, the Alt text assigned to the Formula tag is not read.

Expected behavior:

NVDA should announce the Formula tag (similar to how it says "Graphic" for a Figure tag) and then read the Alt text that's been assigned to the Formula tag.

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

2021.1beta5

Windows version:

Version 10.0.19042 Build 19042

Name and version of other software in use when reproducing the issue:

Adobe Acrobat Pro DC version 2021.005.20060

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

I have not tried with other versions of NVDA but I have heard similar complaints from other users. I do not, however, have access to which versions of NVDA they are using.

If add-ons are disabled, is your problem still occurring?

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

After running the COM Registration Fixing Tool NVDA worked even worse and wouldn't read the PDF at all, beyond the title of the document (in the document's Properties).
Testing a Formula tag.pdf