This is a bug fix release for the 3.x series of Joomla which addresses one bug introduced into 3.9.9 which affects template styles of multilingual web sites, and results in lost data.
Joomla 3.9.9 includes one security vulnerability fix and several bugs and improvements, including:
Security Issues Fixed
Low Priority - Core - Filter attribute in subform fields allows remote code execution (affecting Joomla 3.9.7 through 3.9.
Bug fixes and Improvements
Repeatable Custom Fields: fix to keep HTML tags
Media Manager: Modal layout improved
Voting: Cache cleaned after voting
Article ordering: Items grouped by category first
Batch system: Improvements for Contact and Newsfeed
Remember it is important to keep Joomla and all your extensions up to date to keep bugs and hackers at bay.
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