I lost 3 characters to this bug on Android (even with the latest update). A week ago, I removed 3 renamed characters from my party in order to complete a daily challenge to complete Local Heroes using just Lem. When I went to add them back after completing the scenario, they were completely gone. Kyra, Merisiel, and Ezren were all mid-adventure 3; there was no confirmation prompt or anything. I emailed support shortly after it happened, but never received a response. I have the log file from that day showing the characters pre-loss (with decks & feat counts) that I can send to support if that would help get things restored.