Copy paste parameters not persistent (on material)

[Flavelius]

Godot version:

3.2.3.stable.mono.official

OS/device including version:

Windows 10 x64

Issue description:

Copy params -> paste params onto another material only keeps the pasted values as long as the material is inspected. Even saving doesn't retain them and they're lost upon reselecting the asset.

Steps to reproduce:
See the this demonstration:
https://streamable.com/mpziu8

Edit: There's an error though, i missed:
"Another resource is loaded from path 'res://Shared/Maps/Environments/LandingCave/Rocks.material' (possible cyclic resource inclusion)."