https://github.com/NordicSemiconductor/Android-BLE-Library/blob/331fee93215c6bbc215e8471e389bfb40f3e5ed4/examples/trivia/src/main/java/no/nordicsemi/android/ble/trivia/spec/PacketMerger.kt#L29

For the packet with index larger than 0, the expectedSize is always larger than buffer.remaining().
The right implementation is in HeaderBasedPacketMerger.