LSP completion for @rpc annotation triggers error Cannot get class '@GDScript'

[rcorre]

Godot version

4.0.1

System information

Linux

Issue description

When using an external editor with the Godot LSP, typing @rpc( and requesting completion causes the error Cannot get class '@GDScript' to be printed from the editor.

Steps to reproduce

1. Open a .gd file in an external editor
2. Type @rpc(
3. See error

This happens for each "term" in the rpc, i.e. if I type "authority" I get it once, then type a comma and a ", I get it again.

Minimal reproduction project

N/A

[tentamens]

I am getting this error when trying to type @onready
I am using Godot 4.3 with Neovim on Linux