How to reproduce:
1. Create a new project and open it
2. In the Hierarchy Create two new cubes and name them "First" and "Second"
3. Change the "First" cube's static flag to true (Inspector -> Top right corner -> Static checkmark)
4. Select both of the cubes and right-click the static field
5. Select "Set to Value of 'First'"
6. Observe the static values for both cubes

Expected result: both cubes have the same static flag as the "First" object - static is set to true
Actual result: both cubes have the same static flag - static is set to false

Reproducible in: 2020.1.0a23, 2019.3.1f1, 2018.4.16f1, 2017.4.37f1