Messages of group chat users (multi-user chat) of some android clients can't be visible by other clients
Users A,B,C,D joined to group chat on conf.x.y. All of them use android chatsecure clients and connected to one this server x.y(Prosody in my case).
Users A and B send messages to the group chat. All users(A,B,C,D) see these messages. But if user C or D send message to chat, no one other user don't see these messages but sender. Clients of C and D users rejoin to server under new registered users, but this bug is still was reproduced. Thus this issue is a client bug.
Some another xmpp clients (e.g. Jitsi) receive messages of these "wrong" clients as private messages of multi-user chat (e.g. "User C from email@example.com"), but I think that private messages are not supported by ChatSecure.