Steps to replicate:
- Go to any page on Beta cluster
- Make an edit
- From revision history page, undo the last edit (sometimes that's also failing due to T238253)
- Now make another edit on the same page after undoing the last edit
- Save the page
The following error appears and save fails.
[Xcxc@awQBGoAAGq1uCYAAAAM] Exception caught: Unable to store text to external storage