Not seeing it here either, and there's a Reddit thread that outlines more features missing from the Android 12 official update as well... Google really screwed the pooch on this one, smdh...
That's it... Just tried on the AC app and power plus volume down screenshot yields a capture more button but choosing the screenshot option from the app switcher view does not yield a capture more button... What an idiotic decision that is, Google... Not surprising in the slightest