I find this quite concerning and am really wondering if there are any privacy advantages to Signal if these things happen.

Could you say something on:

1. Have any defend in depth measures been applied in the Android and other clients to make sure this issue does not happen again? E.g., an additional check when sending/encrypting a message to make sure it is absolutely meant for the person it is being send to? 2. Why did it take 8 months to fix this if some users could reproduce it consistently?