Under the hood
Useful1 Signal2
Session events are now assembled by a builder before being uploaded.
What's wrong with this entry?
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What
The session-event sender now awaits a builder that turns the session and payload into the event object it posts, rather than wrapping the payload inline. Retry on a trusted-device token and the 300-character error truncation are unchanged, and non-first-party callers still bail out early.
Evidence
Successfully sent event to session
Strings lifted out of the shipped bundle, so the claim above can be checked against them.