Validate decision-loss problem in incidents

How do teams retain reasoning behind incident decisions? I’ve noticed something in a few teams I’ve worked with, After an incident, we usually: identify a root cause agree on some actions close the case But a few weeks later, when something similar happens again, it’s hard to answer: why that root cause was believed? what evidence did we produce at that time? whether there was any disagreement in the team.

Most of this context seems to be scattered across Slack, Jira, calls, etc. I am curious if you guys actually run into this problem? Or is this not really an issue in most teams?