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[iOS] Existing keys intermittently return false/nil after relaunch without CRC or file-length errors #1691
Description
Environment
- MMKV: 2.4.0
- MMKVCore: 2.4.0
- Integration: CocoaPods
- iOS: 26.6.2
- Device: iPhone17,1
- Mode:
MMKV_SINGLE_PROCESS - Root directory: application sandbox
Documents/mmkv - A fixed non-nil
cryptKeyis used and remains unchanged across app versions. - The
mmapIDis derived from a stable account/tenant identifier.
Problem
We observed an intermittent case where two existing dictionary keys in the same MMKV namespace were both missing after a cold launch:
mmkv.contains(key: keyA) == false
mmkv.dictionary(forKey: keyA) == nil
mmkv.contains(key: keyB) == false
mmkv.dictionary(forKey: keyB) == nil
Activity
github-actions commentedon Sep 22, 2026
👋 Hello! Thanks for opening an issue.
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lingol commentedon Sep 23, 2026
That little info is simply impossible to do any investigation.