How to reproduce:
1. Open the attached project 'case_number_repro.zip'
2. Make sure 'SampleScene' scene is open and enter Play mode
3. Try to enter some numbers from Numpad into the Input Fields

Expected results: All numbers are being typed in the field
Actual results: Only 0, 3, 5 and 9 are being typed in, Numpad key bindings are being called when typing other numbers or Del

Reproducible with: 2018.4.10f1, 2019.2.8f1, 2019.3.0b6, 2020.1.0a8
Not reproducible with: 2017.4.32f1
Regression was introduced somewhere in the 2018.2 stream, but before 2018.2.0b9

Notes:
- Input Field accepts only 0, 3, 5 and 9 and TMP Input Field only accepts 5 and 0, which could mean that the fields only accept Numpad numbers which do not have other bindings
- ',' symbol on the Numpad deletes the character after the cursor
- Player is not affected
- The problematic Numpad numbers behave the same way if the Numlock was off