One thing that stuck out right away was tags: #project-work/Test. Tags in YAML don’t have a #, so that needs to be
tags: project-work/Test
See: https://help.obsidian.md/Editing+and+formatting/Metadata
Looking up a bit, that tag comes from var\_tags = "#project-work/" in the generated template and looking up a bit more, that comes from var\_tag = "#project-" + var\_type\_project in the initial code. I think if you get rid of the #, that will sort out the tags field.
I don’t use kanban much, but there’s a bunch of open issues on their github page. Might be something in there if you’re still getting null after removing the hash tag.