Could someone please explain why using the block form does this?

Because you combine block and string. What you have is equivalent to: 

eval {"Hello!"}

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All you're executing is a string in void context. You don't want a block here - the code you have is in a string, so you want to do string eval. Hence, you ought to be doing 
eval $config->{client}->{1}->{file}->{1}->{executeInternal};

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In reply to Re: eval sub by JavaFan
in thread eval sub by samip

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