Looking at https://github.com/flutter/engine/blob/1b9fb67c428f67be7900012464ed3047d642efca/shell/platform/android/io/flutter/embedding/android/FlutterFragment.java#L977, it seems like it's only overriding the ComponentCallbacks2 that it implements. But nothing seems to be using the ComponentCallbacks2 interface, so it's not entirely clear why it implements ComponentCallbacks2.

It likely needs to call getContext().registerComponentCallbacks(componentCallbacks) on itself and register a ComponentCallbacks2 instance on itself where it can respond to onTrimMemory and pass it onto the VM. This is a problem when the FlutterFragment is used by itself.

b/234889225