Highlight references to symbol under caret not working for symbols used in tuple types (value tuples)

[vsfeedback]

VSF_TYPE_MARKDOWNWhen a variable (local variable or class field) is used in a value tuple, placing the cursor on the symbol in value tuple, does not highlight the other references. This only happens when the symbol is used as a single value in a member of a value tuple. When the symbol is used in an expression, the highlighting works correctly.

Code example:

var value = 1; // #1
var x = (value, 2); // #2

If the cursor is on value in line #2, the other value in line #1 is not highlighted, and the shortcut keys for navigation between highlighted references (Ctrl+Shift+Up/Down arrow) will do nothing.
If the cursor is placed on the first usage (line #1) it works correctly.

Also this code sample works with no problem:

var value = 1;
var x = (value + 1, 2);

because value is used in an expression.

It just happens in VS 2019.
It is all fine in VS 2017.

This issue has been moved from https://developercommunity.visualstudio.com/content/problem/620242/highlight-references-to-symbol-under-caret-not-wor.html
VSTS ticketId: 937020
These are the original issue comments:

Visual Studio Feedback System on 6/25/2019, 04:00 AM (7 hours ago):

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

These are the original issue solutions:
(no solutions)

[jcouv]

Closing as duplicate of #20115