Steps to reproduce:
1. Open attached project "SpriteTest.zip"
2. Add "Test" scene to build settings and build WSA Universal 10 SDK
3. Open VS solution
4. Deploy on local machine and close application
5. Move "test.png" and "valid.png" from Assets folder to "C:\Users\[User]\AppData\Local\Packages\[AppName]\LocalState\"
6. Run the player
7. Press "Button"
Result: Player crashes when trying to create Sprite from a texture ("test.png")
8. Open attached project "SpriteTest.zip"
9. Open "ReadTexture.cs" and change "string sprite" value to "valid.txt" (line 13)
10. Repeat steps 2-7
Result: Sprite is created from a texture ("valid.png")

Expected behavior: Sprite is created from a texture ("test.png")

Reproducible with: 5.3.1f1, 5.4.3p3, 5.5.0p1, 5.6.0b1

Also see attached Callstack