Earthquake isn't halved in Power on Grassy Terrain

[Alex 185]

When using Earthquake with Vibrava, the damage dealt was still normal. For reference, Grassy Terrain should halve the power of Earthquake, Bulldoze and Magnitude. This attribute of Grassy Terrain is unaffected by whether the user is grounded or not. For example, after one Earthquake, the Spinda was nearly KO'd, which should not be the case as shown by the calcs:

Calc without Grassy Terrain:

Calc with Grassy Terrain:

[Plok 293]

halving damage from those moves isn't mentioned in the field effect guide so I'm not sure if this is intentional or not

[Alexandre 2]

Although this might be the case within the normal game I don't think it is an intended feature within Reborn. Take a look at the field attributes in the Field Effects page

Edit: Ninja'd

[Amethyst 2466]

I somehow managed to not know this was a thing in canon.

Thanks.