The v13.8.8 release had some minor errors in it, which have been resolved with two patches.
v13.8.8-p1
- Fixed inserting images on sites with Rich Text Editors: they were previously getting the code for textile image insertion
- Fixed buttons on the custom themes page
v13.8.8-p2
- Assets (js, css and images) were not being "fingerprinted" by default, configured the application to do so