Yeah that makes sense to me too, you also tend to be a lot more insecure and want to prove yourself when you're a junior, so you may be a lot more self-conscious asking for help thinking that it may be perceived as incompetence. I've definitely experienced that when I started working. Being remote probably means that it's even harder to push through this insecurity and it could also mean that others may not see that you're struggling and come help help you spontaneously.

That being said I think it can probably be improved while still remaining WFH, for instance by more actively chaperoning newbies.