Property `size` missing in `/2.0/repositories/{team}/{repo}/refs/branches` API response

Hello!

I'm the author and maintainer of the Refined Bitbucket browser extension, which for one of its features it's hitting the endpoint mentioned in the title and relying on the .size property to show a badge with the number of open branches in the sidebar.

About three days ago, the feature broke because the .size property is not being returned anymore. I checked the documentation in the link below and the property is still documented, which leads me to believe that maybe this was a mistake?

https://developer.atlassian.com/bitbucket/api/2/reference/resource/repositories/%7Busername%7D/%7Brepo_slug%7D/refs/branches

Also, as you can see from the picture, the pull-requests API endpoint which has a similarly-shaped response wasn't affected.

Can anyone confirm what happened here? I have about 4,500+ active users in the extension that are seeing this bug at the moment and I would prefer not to have to rollback the feature

Reference: https://github.com/refined-bitbucket/refined-bitbucket/issues/240