What
When you list other sessions, ones that have turned off incoming cross-session messages are now labelled as such, and an attempt to message them is refused before anything is sent rather than failing later as an unreachable session.
Details
- The listing marks a session unavailable from the server-side metadata field
cross_session_inbound, and the row is rendered with a short label. - The permission path denies the send and records the failure as
errorClass: "recipient_gate_off". - No flag: it depends on the peer's metadata being present in the listing. A warm-cache lookup that throws falls open to "unknown", so the send is attempted as before.
Evidence
can't receive cross-session messages (off in that session)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.