AutoSave not turning on for Checked Out Documents

AutoSave is a great feature. My users have loved it since it launched in July, and they all know that if they save to SharePoint Online that this feature just works. This week we found an exception: AutoSave will not automatically turn on after a document is checked out from a SharePoint Library.

Here's why: AutoSave will always tell you why it's turned off, all you need to do is hover your cursor over the AutoSave icon. 

Ok, that's normal. Now check the document out:

It recognizes that you CAN turn autosave on, but it doesn't automatically turn it on for you. You can *manually* enable it; however it doesn't automatically turn itself on. This has led to quite a few scenarios where users thought they were covered by AutoSave since they were working in SPO and they weren't. I think this is a bug, but it may be an intentional feature. If you want to see this behavior fixed please vote for the UserVoice item below.

UserVoice: https://sharepoint.uservoice.com/forums/329214-sites-and-collaboration/suggestions/31526038-autosave-for-checked-out-documents