PostHog/posthog-js posthog-js@1.396.4

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1.396.4

Patch Changes

• #4035 18e543b Thanks @posthog! - fix(web): isolate onFeatureFlags callbacks so a throwing user handler no longer breaks the remaining callback chain or gets misattributed as an SDK error
  (2026-07-01)

• #4039 15bcb42 Thanks @github-actions! - fix(replay): measure $snapshot_bytes as UTF-8 byte length instead of UTF-16 string length, so non-ASCII session replay payloads are counted accurately against the message size limit
  (2026-07-01)