Why should that be unintended?
See perlop on Quote-like operators, where here-documents are equivalent to nomal double-quoted strings, and that certainly holds true for the scope where they are evaluated in. This scope is determined by the place where the <<"FOO" occurs, not where the end of string marker sits, since here-docs are a line-oriented quoting mechanism.
I'm pretty sure that this behaviour is intentional and has been a long time in Perl and will stay.
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