Word online/web - reviewing mode results in re-load error

I was today year's old when I learned that Reviewing mode in Word online/web is the equivalent of track changes when using Word online, on its own, or inside of Teams.

I now understand that when you put a document into Reviewing mode, it tracks your own changes only, but that you can change this to track for everyone by going to Review > Track Changes > For Everyone.

The problem we are encountering is that when someone puts it into Reviewing mode for themselves or for everyone, it results in a reload error telling us our changes are lost and it reverts back to editing mode. 

What's the solution here?

Also is there a way to make it default to track changes for everyone when you toggle to Review mode?

What is the fix for this?