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In trying to fuzz test a different issue, I ran into a reproducible case where we end up with a broken handlescope stack. The issue requires a large number of handlescopes created with aggressive GC, so hopefully it isn't something that too many users have run into. The issue is that a single HandleScope address is used to initialize two HandleScopes. The fix could just be to create a 2nd HS variable (to get a 2nd address), but the first initialization is unnecessary and can just be removed. (Note that EventManager dispatch creates its own HandleScope, so the one removed in frameCompletedLoading really did nothing)