gnus-article-unpropagated-mark-lists

gnus-article-unpropagated-mark-lists is a variable defined in `gnus.el'.
Its value is

(seen cache download unsend score bookmark unexist)

• This variable may be risky if used as a file-local variable.

Documentation:
Marks that shouldn't be propagated to back ends.
Typical marks are those that make no sense in a standalone back end,
such as a mark that says whether an article is stored in the cache
(which doesn't make sense in a standalone back end).