Notwithstanding chromatic's comments, the reason this doesn't work is that SUPER respects __PACKAGE__: the compile-time package setting, not the runtime package. Consider this:

package Foo;
sub Bar::bletch {
  ...
  $self->SUPER::bletch(@_);
  ...
}
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That's right... SUPER:: goes to @Foo::ISA, not @Bar::ISA. Oops.