How to reproduce:
1. Open the "SampleScene" scene in the attached "imguibug.zip" project
2. Change the UI scaling to 125% in Preferences > UI Scaling
3. Enter the Play Mode
4. Try clicking on any of the buttons

Expected Behaviour: Logs printed into the console indicating that either button 1 or 2 was pressed
Actual Behaviour: Nothing is printed unless you press slightly above the button

Reproducible with: 2019.3.12f1, 2020.1.0b8, 2020.2.0a9
Could not test with: 2018.4 as it does not seem to have UI scaling preference

Note: This only seems to happen when the button is instantiated from code using GUILayout and has a label above