Hello, Community 
I was trying to test to use 'Shortcut Links' but it didn't work.
So, I looking for 'Why' so far but I couldn't find the reason.
I found only these things as below:

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It doesn't say about "ended support".

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It doesn't say about "ended support" too.
(Last modified on Jan 23, 2020)

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Finally, It says about "ended support" but also they say "can still be added and used on pages".
Tell me why I can't use Shortcut links, please.
Is this a bug?
Thank you.
Regards,
Takahashi