JAWS2020+Firefox reads first item in radioradiogroup two times

[Leuvarden]

Summary

Example:

1. Go to https://www.w3.org/TR/wai-aria-practices-1.1/examples/radio/radio-1/radio-1.html with JAWS2020 on
2. Tab to first radio button

Expected result

First radio is read one time

Actual result

First radio is read two times

Example

A test case that demonstrates the issue - provide linked test case, CodePen, JSbin, etc...

Additional Information

JAWS version and build number

JAWS 2020.2006.12 ILM

Operating System and version

Microsot Windows 10 Enterprise
10.0.18363 Build 18363

Browser and version:

Firefox 81.0.1 (32-bit)

[frex65]

Bug confirmed using JAWS 220.2008.24 in FF81. Works as expected in Chrome 86 and Edge 86.
This issue is related to, but not identical to, issue #459 .