To reproduce:
1. Open user's attached project
2. Build and Run on Android
3. Try inputting any emoji in the text field

Expected result: Emoji appear in the PlayerPrefs field
Actual result: Emoji appear as an invalid symbol in the PlayerPrefs field, but the keyboard text field shows emojis as expected

Reproduced with: 2017.4.32f1, 2018.4.8f1, 2019.2.4f1, 2019.3.0b2, 2020.1.0a3

Notes:
On Windows build and in the Editor emojis can not even be inputted except few (heart, smile, ...) but they appear only black and white
iOS devices do not even let type in any emojis

Reproduced with:
VLNQA00153 Google Pixel XL 10 Snapdragon 821 MSM8996 Pro Adreno (TM) 530 OpenGL ES 3.2
VLNQA00123 Google Pixel 2 XL 9 Snapdragon 835 MSM8998 Adreno (TM) 540 OpenGL ES 3.2
VLNQA00224 Samsung Galaxy A5(2017) 8.0.0 Exynos 7 Octa 7880 Mali-T830 OpenGL ES 3.2
VLNQA00052 Xiaomi MI MAX 7.0 Snapdragon 617 MSM8952 Adreno (TM) 510 OpenGL ES 3.2
N/A Xiaomi Mi 5 6.0.1 Snapdragon 820 MSM8996 Adreno (TM) 530 OpenGL ES 3.2
VLNQA00022 Xiaomi Redmi Note 3 5.1.1 Snapdragon 617 MSM8952 Adreno (TM) 510 OpenGL ES 3.1