
No news is good news (not)
The best project manager I ever worked with had a mantra that he repeated to everybody in the team on a regular basis: "I don't care if it's good new or bad news, just tell me". The idea was that the earlier he knew about changes, good or bad, the better he could plan ahead and navigate around the icebergs and floating containers with minimal effort.
In practice, this is an issue I've seen on so many projects: people who would withhold bad news until the last minute, at which point it was too late to do anything sensible about it, resulting in massive impact on timelines and budgets.