Yep, that's likely it. Whether this is a bug or a feature is up in the air--personally I don't think you're supposed to be able to jump into the middle of a block, but...
Comment on Re: Re: Bare blocks forgetting lexical values
Personally, I think of it as a feature. It does what it says it does, just not what some would expect. I've never used it as I've always had the feeling it would be fixed and making an outer scope is simple and clearer.