Not on Win2k / ActivePerl 5.6.1 they don't. So this could be a platform issue then?

No eval        :1
In str eval    :1
In block eval  :1
Block Eval ret :1
Str Eval ret   :0
Str Eval ret2  :0
[download]

Update:

On the same machine, with cygwin and perl 5.6.1, it runs fine:

No eval        :1
In str eval    :1
In block eval  :1
Block Eval ret :1
Str Eval ret   :1
Str Eval ret2  :1
[download]

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It is pitch black. You are likely to be eaten by a grue.