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`makeEnvironmentProviders` constructs the wrapped `EnvironmentProviders` type, which can only be used in environment injectors (not element injectors). It makes sense that `makeEnvironmentProviders` should be able to accept existing `EnvironmentProviders`-wrapped providers, since it will be providing the same guarantee, but the current types do not allow this. This commit fixes the typings to allow nesting `EnvironmentProviders` and adds a test to verify that it will work. PR Close #48720