REPLACE_BASH failing on textproc/p5-Test-YAML

[David Brownlee <abs%absd.org@localhost>]

textproc/p5-Test-YAML/Makefile has

USE_TOOLS+=     bash:run
REPLACE_BASH+=        bin/test-yaml

and Test-YAML-1.05/bin/test-yaml gets '#!/usr/bin/bash' replaced by
'#!/usr/pkg/bin/bash'.

But when it generates Test-YAML-1.05/blib/script/test-yaml that comes
with #!/var/obj/pkg/textproc/p5-Test-YAML/work/.tools/bin/bash which
is then copied to .destdir/usr/pkg/lib/perl5/vendor_perl/bin/test-yaml
and fails the word-directory references check.

Does anyone have any thoughts as to what might have changed?

(latest pkgsrc, netbsd-6 amd64)