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amertak
approved these changes
Mar 2, 2026
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Description
The anonymous user ID was persisted lazily — only when the first span fired. This asymmetry created a race window: if a second tab opened after the session was written to storage but before the first span in the first tab, the second tab would find no anonymous ID in storage and generate its own, resulting in a single session having multiple anonymous user IDs.
Type of change
Delete options that are not relevant.
How has this been tested?
Delete options that are not relevant.