When I edit info on my list the field “Tags” is always empty, even if the list had tags before. Clicking “Save” erases all tags.
Inputting new tags into that field works, tags appear to get stored in the database (they don’t show up instantly below the list but a tag filter finds my list). Any subsequent list edit would erase them again unless you re-type them into the form every time you edit a list.
Related: Add tags to list