On my phone (chrome on android), basically any google search result from reddit goes to the amp version of the page.
(with all five visible comments, and since the full comments are almost certainly what I was searching for, I end up having to click through to the full page anyway every time)
There is an incompatibility between the Reddit app and Reddit amp links. If the Reddit app is not installed, they load just fine. Reddit likely could fix that if they were told about it. I have no idea how to tell them though.