Main Issue

If the current state of the new Beta-APIs eventually end up getting released, there will be no definition support for IDE applications. This will not be possible because the module name (@minecraft/server) has a "/" in it. As you might already know, you cannot put a "/" in a file's name. This affects the IDE apps because you will now be able to make a definition folder located in "C:\Users[USER]\AppData\Local\Microsoft\TypeScript\4.8\node_modules@types". An IDE app will not know the definitions by default and there will be no place to get them from. Without the Beta-APIs toggle, the current module name is "mojang-gametest". This works because there are no special characters that prevent the definition folder from being created.

How to fix

Rename the current Beta-API module name to something without a "/" character. Possibly something like "@minecraft-server".