Input Field in Unity does not accept half of large Russian characters, what should I do?

Question

User interface

Hello, I understand Unity UI and then it came to the Input Field, I set everything up (multiline, font, etc.) I start testing and I notice that I can’t enter half of the large Russian characters into this field (Example: Y and F are entered , but B, A and P do not!). At first I thought it was a font issue, but I tried others and nothing has changed, what should I do?
Thanks!)

Answer 1

Bug fixed in 2018.3:
https://issuetracker.unity3d.com/issues/korean-ime...