Editor doesn't remember Scene's snap settings

Created by: rodri042

Godot version: 3.2.stable.official

OS/device including version: Windows 10

Issue description: The editor doesn't remember my grid options in 3D. When I open my scene, the grid is always set as 0.1, 0.333333 and 0.625.

Steps to reproduce: Here's a GIF:

Minimal reproduction project: https://github.com/rodri042/test-godot-3d/tree/b773cdf38d51531a51cb5a809be858bc7ce22f99