If the senior developers are grumbling about not wanting to be in the same room as their coworkers, I wouldn't be surprised if the junior devs feel nervous about asking for a few minutes of their time.
It is the job of senior devs to make new employees feel like part of the team.
Even worse when you're in an isolated zoom meeting with a senior dev, and they're talking trash about other developers on your team. There's constructive criticism, and there's macho posturing by fucking douchebags. Even worse when you mention it to management, and they do nothing.
It is the job of senior devs to make new employees feel like part of the team.