Same user keeps on being added to messenger list.

Summary

Same user keeps on being added to messenger list.

Steps to reproduce

Not sure how to reproduce. I was sending test messages to another channel when this started happening.

Platform information

Mobile Native Android

App version

3.12.1

What is the current bug behavior?

Channel keeps getting added to messenger list.

What is the expected correct behavior?

This doesn't happen

Relevant logs and/or screenshots

channel guid: 1023616090707599371