Aria-selected is not narrated for the gridcell

[kolaps33]

Steps to reproduce:

1. Navigate to the example: https://codesandbox.io/s/pqrni?module=/example.js
2. Navigate into "Select a date. edit"
3. Open date picker and choose any day different from today (day is selected and picker closed)
4. Open date picker again and navigated to the day which you selected in the previous step
5. observe narration

Actual behavior:

For example, when 20th of January was selected narration was: "January 20, 2021 row 5"

Expected behavior:

it narrates "selected" state as well Expecting this narration, because:

• JAWS narrates it and
• it should be supported by aria documenation: https://www.w3.org/TR/wai-aria-1.1/#aria-selected

Snippet of HTML of element which is focused: <button role="gridcell" aria-selected="true" data-aa-class="DatepickerCalendarCellButton" class="ui-datepicker__calendarcellbutton il iz ja bg bh jb jc jd je iu ip iv ir jf jg jh ji is as bp bq br bs bt bu bv bw bx by bz ca gs gt gu gv cf cg ch ci cj ck cl cm cn co cp cq cr cs ct cu cv gw gx gy gz da db dc dd de df dg dh di dj jn jm iw ix" aria-label="January 20, 2021" tabindex="0">20</button>

System configuration

NVDA installed

NVDA version: 2020.3

Windows version:

10.0.19042

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

Chrome Version 87.0.4280.88 (Official Build) (64-bit)

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.

no haven't

If addons are disabled, is your problem still occuring?

no addons enabled

Did you try to run the COM registry fixing tool in NVDA menu / tools?

no