I am using Tor Browser 11.5.7 (based on Mozilla Firefox 91.13.0esr) (64-bit)

Earlier, when I browsed a site *in Tor Browser) which has a .onion counterpart, the browser would suggest, do you want to visit the .onion site or stay here (something like that). Now it is not doing that.

  What might be the reason? How can I get the early behavior?

I am using Tor Browser 11.5.7 (based on Mozilla Firefox 91.13.0esr) (64-bit)

torproject support says:

Onion-Location is a new HTTP header that web sites can use to advertise their onion counterpart. If the web site that you're visiting has an onion site available, a purple suggestion pill will prompt at the URL bar saying ".onion available". When you click on ".onion available", the web site will be reloaded and redirected to its onion counterpart.

Earlier, when I browsed a site (in Tor Browser) which has a .onion counterpart, the browser would suggest ".onion available". Now it is not doing that. What might be the reason? How can I get the early behavior?