The Help link for Writing Meta (https://writing.meta.stackexchange.com/help) actually redirects to the help page for Writing (https://writing.stackexchange.com/help), so it's not possible for me to determine if there are any unique policies around the Writing Meta site specifically.
I recently posted a question here on Writing Meta, and received an upvote for it, but received no notification of a reputation change—nor is such being indicated on my profile.
Update: This is by design for all Meta sites aside from the main Meta site for Stack Exchange as a whole. It is actually mentioned in the "meta" section of the regular site's help pages—not in the reputation section.
Since this applies to all Meta sites, the pursuit of any feature request to change it would likely be more appropriate at the global Meta site.
Mostly likely getting this information into the "reputation" section of regular site help pages, so that it's more discoverable, would be best pursued that way too.