Yeah, there are a lot of problems with Godot 4 web exports generally - due to the fact that it's a lot more multi-threaded in general than Godot 3, which presen

Yeah, there are a lot of problems with Godot 4 web exports generally - due to the fact that it's a lot more multi-threaded in general than Godot 3, which presents problems for web exports and requires certain features to be enabled server-side via headers. Godot 4.3 "fixes" this by allowing you to export a single-threaded build - which obviously isn't the ideal fix, more of a workaround that may result in worse performance. Godot 3.x supports web exports for C#, due to the mono runtime being long available as a WASM target. But .NET Core still doesn't quite work there, there are experimental builds while using Blazor specifically, but for hosted runtime stuff (such as Godot) the support isn't there yet, despite MS promising it since .NET 6 it hasn't arrived yet.