Could be just the team culture. The meeting thing is pretty weird, but what happens if you just show up and tap them on the shoulder? Do they get annoyed or overall happy to chat? What about just drinking coffee/tea?
It also can be that the office space itself is too noisy so any discussion can distract a lot of people.
It sounds weird indeed, but maybe some higher-ups decided this is a way to go in case people need to be isolated again or when it's necessary to hire some remote coworkers who shouldn't be left behind, etc.