Fix for regression introduced with

https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=8f0ea507e3b3383dbc9b93c43399dd4745810ad3

When output profile is CIELAB and the file has transparency, the
blending color space should be set to RGB.  Unfortunately a typo
made this not occur for the clist transparency case.

Can be replicated for files with transparency with

-r300 -sDEVICE=tiff24nc -sOutputICCProfile=lab.icc -o output.tif input.pdf