Steps to reproduce:
1. Open attached project "881845.zip"
2. Builf for WSA Universal 10 SDK
3. Open VS solution
4. Deploy on local machine
5. Focus the InputField and enter some text
6. Press CTRL+A or select text manually
7. Press CTRL+C to copy the text

Expected result: text is copied
Actual result: text is not copied and is deleted instead, also the text indicator appears in the middle of the InputField and typing text afterwards doesn't appear in the InputField

Alternatively:
1. Press CTRL+V to paste the text
*nothing happens*
2. Try to enter some text in the InputField
*nothing happens*
3. Press CTRL+V to paste the text
*text is pasted and you can see the text you've entered before before the text you have just pasted*
4. Try to delete the text by pressing backspace
*after deleting the text you've pasted the text before the pasted text disappears and text indicator appears in the middle of InputField*

Reproducible with: 5.4.4p1, 5.5.1p3, 5.6.0b9

Not reproducible on Editor