Project related endpoints fail with 500 on: `unable to nest the invite_members_in_side_nav experiment within the billing_in_side_nav experiment`

During error budgets investigation I have found out that some project related endpoints are failing due to:

ActionView::Template::Error
unable to nest the invite_members_in_side_nav experiment within the billing_in_side_nav experiment

https://sentry.gitlab.net/gitlab/gitlabcom/?query=is%3Aunresolved+unable+to+nest+the+invite_members_in_side_nav+experiment+within+the+billing_in_side_nav+experiment