Good reason for pairing/working in proximity with a partner. Juniors onboarding understandably miss silent signals. They won't even realize they should ask a senior because there's no event to which they should react.
"Novices don’t know what is typical, so they have a hard time identifying what is atypical. Experts can quickly spot unusual events and detect deviations. And, they are able to notice when something that ought to happen, doesn’t."
https://commoncog.com/an-easier-method-for-extracting-tacit-knowledge/
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This communication gap is widened in distributed environments. Expecting juniors to immediately setup a video call with a senior asking "hey, I have no idea what's going on and there is no data" can be a delicate topic and expectation. Depending on the organization, that behavior can either signal "proactively reaches out to unblock progress" or "fails to deeply investigate issues".
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IIRC https://learning.oreilly.com/library/view/inmates-are-running/0672326140/ has a section on creating empathetic error messages that's helpful.
Expecting people to respond to a signal's absence without informing them it should exist doesn't set them up for success.