What
When two messages are merged, the result is now marked ephemeral if either input was, on both merge paths.
Evidence
ephemeral: !0
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Merged messages keep their ephemeral status
Merged messages stay ephemeral if either half was.
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release