The thing with working from home is you no longer have the casual chats with the people in the desks nearby or that communal back and forth at the drinks machine and in the cafeteria. The only time you actually talk to the people you work with is official meetings, or when making calls to ask specific questions, not to engage in a couple of moments of free-form conversation or spark ideas on whatever you're working on.
It's no longer a "I can throw an idle question at so-and-so the desk over when I'm having a problem with some are of work", but more of a wait until its significant enough to actually make time to do a microsoft teams call to someone about that specifically..
It's got lots of benefits on flexibility and not wasting time on travel, but then it does tend to kill some of those small moments of engagement.