We’ve identified the problem that lead these pages to be blank: this was caused by an update wherein API members were moved from a class to an abstract superclass (Workspace now inherits from the abstract WorldRoot). We use an automated tool that imports the current members of the Roblox API, but it doesn’t recognize “movements” of API members, only additions and removals. In other words, it noticed the removal of Workspace:FindPartOnRay and the addition of WorldRoot:FindPartOnRay, but it was not designed to migrate content. This is why the information disappeared from the DevHub.
Changes like this (API member movements) happen extremely rarely. This didn’t change any existing behaviors, as you could still use Workpsace:FindPartOnRay the same way - so that’s why this got put under low priority. We apologize for the inconvenience. The content will be migrated by hand from the previous pages this week.