Cannot activate Xcode Edit>Substitution menu

When editing a Swift file in Xcode 12.2, I wanted to change the quotes autocompletion.

For this I looked at the Edit > Substitution menu and selected smartQuotes.

From this point, the whole substitution menu is disabled, no way to enable back.
Opened another file: same issue.
Opened another older version of Xcode: the same.
Opened Xcode 12.2 on another Mac: same thing

How can I re-enable the menu ?

Whilst typing this message, I tried again and the menu is once again reactivated ! I did nothing (at least intentionally).
Was it some type of time out or time required to complete a task ?
But did not return to normal on the other Mac.

But now, 10 more minutes later, it is disabled once again…

That's the type of surprise effect I do dislike in an app…
Answered by Claude31 in 653321022
I file a bug report: FB8943633.

I will report any feedback.
Accepted Answer
I file a bug report: FB8943633.

I will report any feedback.
Cannot activate Xcode Edit>Substitution menu
 
 
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