Looks like this is intentional. To change it back go to chrome://flags/#omnibox-ui-hide-steady-state-url-scheme-and-subdomains and disable the setting.
Additionally, if this flag ever goes away, the "kFormatUrlOmitTrivialSubdomains" is the internal flag for this, it seems[1], though its description says it's "Not in kFormatUrlOmitDefaults"[2].
Back when they removed the "http:" off of URLs, I used to use a hex editor to turn the kFormatUrlOmitHTTP bit flag off every time I got a new build, so I'd get the URL formatting I wanted, but eventually lost the mental wherewithal to continue the hack every week.
Until Firefox leadership decide to make the same change "because that's what Chrome does". Sadly, over the history of Firefox (and before that, Mozilla/Seamonkey) the leadership there has always been WAY too obsessed with following IE and/or Chrome rather than just building the best browser and taking some chances.
Seriously, trawl through Bugzilla sometime and look how many bugs are closed with the the justification being some variation of "That's how IE does it" or "IE doesn't support that", etc. And then substitute "Chrome" for "IE" later in history once Chrome took over the universe.
Back when they removed the "http:" off of URLs, I used to use a hex editor to turn the kFormatUrlOmitHTTP bit flag off every time I got a new build, so I'd get the URL formatting I wanted, but eventually lost the mental wherewithal to continue the hack every week.
[1] https://github.com/chromium/chromium/blob/3d41e77125f3de8d72...
[2] https://github.com/chromium/chromium/blob/78aae16be65e409075...