Fast-follow asset bundle intermittently fails with BundleUnavailable despite correct setup

[SeanLangre]

Summary

I'm encountering an intermittent issue with Play Asset Delivery using Unity. A fast-follow asset pack (battlebackgrounds) sometimes fails to load with the error BundleUnavailable, even though:

• The app is installed from Google Play (com.android.vending)
• The asset pack is correctly defined and set to fast-follow
• The AAB is properly structured and builds without error
• The asset works on other devices
• It eventually works again without changes, making this seem like a backend delivery issue

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Environment

• Unity version: 2022.3.42f1
• PAD version: 1.9.5
• Delivery type: Fast-Follow
• Track: Internal Testing (but also verified in Production)
• Device: Huawei CMR-AL09 (Android 9). Happens on Pixel 7 Pro as well.
• Installer: com.android.vending (Google Play Store)
• Internet: Stable, Wifi.
• Tested on other devices: Yes. It happens on other devices as well. Like Pixel 7 Pro for example.

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Note: This happens both on internal testing track and in live/production releases.

Is this a known issue with fast-follow delivery timing or caching in PAD? Are there any recommended strategies for handling this kind of intermittent failure?