Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
SessionsArea: what it touches
Internal ChangesKind: in v2.1.242,
Internal ChangesSection of the release
What
A key that names a session's own journal is now rejected if it also carries an agent id, an agent path or a run journal, with a message spelling out the rule.
Evidence
a session journal key names the session's own journal: no agentId, agentRelPath or run journal
Strings lifted out of the shipped bundle, so the claim above can be checked against them.