Today Groundspeak released 4 new attributes. See https://www.geocaching.com/blog/2020/09/four-new-geocaching-attributes/.
Of course this means changes to challenge checkers to cope with new attributes. And I hope everyone will update their caches pages to suit (I already have updated mine).
The cache page has a solution checker. This more of an attribute of the cache page than an attribute of the cache itself. It could have been automatically applied on existing caches but has not (yet?). Applied automatically on new puzzle/unknown cache types that have a Solution Checker
This is a compromise from earlier requests to make challenge caches their own type, but as I see caches still being published with "challenge" in their title that are not challenge caches, I wonder if this attribute will get correctly applied by cache owners. It has not (yet) been automatically applied to PGC's list of challenge caches. Only available on a puzzle (unknown) cache type.
Cache is a bonus cache. Only available on a Puzzle (unknown) cache type.
Cache is part of a power trail