Godot 4 one-way migration breaks Godot 3 GDExtension binaries
One-way migration and native module compatibility Godot 4.x opens Godot 3.x projects through an automatic, one-way upgrade that rewrites scenes, scripts, and project settings. While the migration tool renames or removes numerous core APIs, Godot 3 GDExtension and custom C++ modules are binary-incompatible with Godot 4 and must be recompiled against the Godot