In our office we have somepeople that have Adobe Acrobat Pro 2020 - Classic and some people have Adobe Acrobat Pro - Continuous Release. 
We believe there are missing accessibility issue flags in the Acrobat Pro 2020 - Classic, specifically with the table headers, however, we are not certain if the issue extends byond this. 
We will run the checker on a document and in Acrobat Pro - Continuous Release there are more issues flagged than there are in Acrobat Pro 2020 - Classic. 

Here are the following steps we follow on both Classic and Continuous Release:

Step 1: In your PDF, go to your Accessibility tool on the right-hand side of the window.

Step 2: Click on Accessibility Check

Step 3: Click on Start Checking (same result regardless of category)

Step 4: Review the Issues - this is where the error shows up. We see more in the current release version than we do in the classic version.

I included the Abouts for both to show the versions.
I also included the results for the Classic version and the Current Release version for the issues flagged by the accessibility checker. The current release is the expected outcome and the Classic is the observed outcome.

This is being done on Windows 10 Pro.