[NaS]

There must be something else, this code is not the problem.

Is OnPlayerRequestClass called correctly or not? Is TogglePlayerSpectating used somewhere during login or in OnPlayerConnect?

Any FilterScripts that could interfere? Check the return statements of those scripts in the related callbacks - FilterScripts come first and could theoretically block the callbacks of your gamemode from being called. Check the wiki to see which callbacks actually handle return values and make sure they are correct.