The reason that this is needed is that, without a *.install file and multiple packages defined, the default behaviour is python3-{pybuild name}. This is the name of the folder that files are packaged into - and needs to be forced to match the main package.
This should fix packaging issues that were worked around in v5.1.0-4. Source: https://wiki.debian.org/Python/Pybuild
The reason that this is needed is that, without a
*.installfile and multiple packages defined, the default behaviour ispython3-{pybuild name}. This is the name of the folder that files are packaged into - and needs to be forced to match the main package.