EXC_BAD_ACCESS crash during Crowdin realtime localization update on UILabel

[sth-nvajda]

When CrowdinSDK realtime updates are enabled, calling UILabel.refresh() triggers a crash (EXC_BAD_ACCESS) inside StringsLocalizationDataSource.findKey(string:). The crash occurs during dictionary iteration while looking up localization keys, likely due to a dangling pointer or concurrent access to the internal localization dictionary.

To Reproduce:

1. Enable CrowdinSDK realtime updates in the app.
2. Display a UILabel that uses Localization.keyForString or the SDK’s swizzled setText to apply localized strings.
3. Trigger a localization refresh (e.g., update user language or receive a Crowdin realtime update).
4. Observe the app crashing with EXC_BAD_ACCESS in StringsLocalizationDataSource.findKey(string:).

Expected behavior
UILabels should safely update their text without crashing when Crowdin realtime localization updates occur.

Screenshots

Device: iPhone 12 / Simulator

OS: iOS 26.0, using xcode 26.0

Additional context

Crash occurs consistently when a UILabel is refreshed during a Crowdin realtime update.

Stack trace indicates dictionary iteration in StringsLocalizationDataSource.findKey(string:) fails.

Suspected causes: concurrent dictionary access, dangling pointer, or Crowdin realtime update closure retaining a deallocated object.

Disabling Crowdin realtime updates prevents the crash.