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Migrating an App Engine Standard application from Java 8 to Java 11 and including bundled services can pose several memory challenges. Some of these challenges include:

1. Increased memory usage: Java 11 requires more memory than Java 8, and including bundled services can further increase the memory requirements of the application.

2. Memory leaks: Some code written for Java 8 may not be compatible with Java 11, which can cause memory leaks and increased memory usage.

3. Garbage collection inefficiencies: Garbage collection in Java 11 is different from Java 8, which can lead to inefficiencies in memory management and increased memory usage.

4. Resource limits: The App Engine Standard environment has resource limits, which can cause issues if you exceed the memory or CPU limits while migrating to Java 11 and including bundled services.

5. Compatibility issues: Bundled services may have compatibility issues with Java 11, which can cause memory-related problems in the application.

To mitigate these challenges, it's important to thoroughly test the application after migrating to Java 11 and including bundled services, monitor memory usage, and optimize the code for efficient memory management.