It looks like you’re missing the “Manage shared info” section and “Personalized Shopping” link, which yields the above toggle for me (CA, US)…
The question is, is it gone because your privacy laws make it impossible to even offer, or because your privacy laws don’t require them to care about your opinion at all?
I think K9 is also moving to Material 3 (there’s an identically versioned K9 Beta, I haven’t tested it though).
The only changes to my knowledge for Thunderbird is branding and colors.