While using the Brush in the Launch Upgrade test branch, I came across a problem. If you set the slider higher than 1800g and placed a gas, it would default to 1800g. The same happened with liquids and solids at 3870Kg. The bug happens with both the Brush and Fill tools.
I tried to set some oxygen in my base from 5-6Kg to stop stress from rising in my sandbox world. I used the Fill tool and changed the amount to 3Kg. When used, it seemingly ignored my input and placed 1800g instead. It did the same when using the Brush tool.