Custom resource type appears in every resource dropdown, even if the class would mismatch

[Zylann]

Godot 3.1 alpha4
Windows 7 64 bits

I defined a custom resource type named HTerrainData, which is registered this way:

const HTerrainData = preload("../hterrain_data.gd")
[...]
add_custom_type("HTerrainData", "Resource", HTerrainData, get_icon("heightmap_data"))

However, I noticed that my resource type now shows up everywhere, sometimes multiple times, even in places where it has nothing to do:

Even for textures:

Reproduction steps:
Create an editor plugin that registers a custom resource type.

[JFonS]

Comment on note: I's fine to have ShaderMaterial in the process material slot, that's expected.

[Zylann]

@JFonS my mistake indeed

[Phischermen]

I've been working on a pull request (#34828) to solve this. It works on the 3.2 branch, and I can't really test on the 4.0 branch due to some other issue regarding custom resources (#39136).

[KoBeWi]

Looks like custom types don't appear in resource lists at all now. They are only listed in New Resource menu in FileSystem Dock, but only if the base type is Resource.

Technically the original issue is fixed, so closing. Custom types are supposed to have been deprecated by now. class_name custom type will work correctly.