reopen 1031362 found 1031362 1.12.0+ds1-4 thanks Hello.
This was a bug in the package called "python-pycdlib". You added a Build-Depends:tzdata in package "python-pyeclib". According to Policy, we should not add a BD on packages which are not really required during build, so now we have two bugs. I'm just reopening this one, but you might want to remove the undesired BD of python-pyeclib in git. Thanks.