One of the biggest design issues plaguing modern times in my opinion is late-loading content moving around content that is already there.
This is a problem as, especially with fast users, they are probably already about to click something. For them, the layout change can result in clicking on the wrong button. For others, it can result in irritation as the text they read suddenly moves. Anything that interferes with muscle memory/routine is super painful.
When quick answer kicks in, a few seconds late in my case, the layout moves - the search results are pushed downwards. By the time it kicks in I'm already busy reading results and clicking on them, so what I am experiencing is that the link I'm about to click on jumps down a few hundred pixels. Even worse, as quick answer generates new lines, the search results keep being pushed down.
Example query: "how to learn python in 2024"
Quick answer to not be layout breaking (for example, using a fixed-height scrollable box that can be expanded, should the user find the beginning of the answer useful and want to read the rest.