Slicing a sprite with transparency outside of the selection will create alpha blending on the edges of the sprite

Reproduction steps:
1. Open the attached project 'Sprites'
2. Open the available scene
3. Observe the sprites either in Scene or Game view

Result: Slicing a sprite from a sheet with transparency, causes the sprite to have edges with alpha blending. The effect does not seem to occur when Sprite Mode is set to 'Single' and Filter Mode to 'Point'. (top right box in the attached image)

Reproduced with: 5.5.0a2, 5.4.0b24, 5.3.5p5, 5.2.3p3