How to reproduce:
1. Open the attached "positionBug.zip'' project
2. Open the 'SampleScene' scene
3. Select the "Cube" Game Object and transform it horizontally with "Move tool". Notice that gradient shader has is fixed position
4. Duplicate "Cube" Game Object
5. Transform any 'Cube' Game Object horizontally with "Move tool"

Expected result: Shader is not changed
Actual result: Gradient shader has is moving

Reproducible: 2018.3.12f1 (LWRP 4.10.0 version)
Not reproducible: 2018.3.0a1 (2.0.8 package version), 2018.3.0a6 (2.0.8 package version), 2019.1.0f1 (5.7.2 package version), 2019.2.0a11 (5.7.2 package version)
Can't reproduce: 2018.3.0b1, 2018.3.0b4, 2018.3.0b6 because of missing LWRP asset