Steps to reproduce:
- Go to any Talk: or User_talk: page on enwiki
- Tap "New Topic"
- Fill in the "Subject" and "Compose message" fields with whatever
- Tap the blue check mark to save
The expected result, is that, at some point in this process, you see these words:
The actual result is that you never see these words at any step, and your message saves.
Tested in version 2.7.50350-r-2021-04-07.