Ethan Lazuk shared a screen shot showing how a snippet was recently updated by Google but the people also ask version was not, and was still showing the 2017 version. This shows that Google can show a snippet in two different spots from different times those snippets were indexed.
Ethan wrote on Twitter "We updated a blog post from 2017. The regular snippet pulls the new title tag and updated text for a description, but the People also ask box right below it shows the old version of the text. Is the latter updated at a different rate?"
John Mueller of Google responded that it "looks like it."
Looks like it :)
— 🍌 John 🍌 (@JohnMu) May 1, 2020
Does seem interesting but based on what we know of how Google works, this should not be surprising.
Forum discussion at Twitter.