Adding commentary causes 403 error

Currently attempting to add commentary to https://danbooru.donmai.us/posts/2644956?pool_id=10027 because it existed but it refuses to let me.

When I upload the comment, it takes me to >https://danbooru.donmai.us/artist_commentaries/create_or_update.js
and then from there it gives me 403 error and says I have no access rights.

It's a known issue, it's been fixed but we're waiting for deployement.