Apple has released a new update to Logic Pro X. Version 10.4.4 fixes the recent bug where auto backups were not being created as expected. There are other under the hood bug fixes as well.
Logic Pro X 10.4 release notes
Learn about Logic Pro X 10.4.
Before updating Logic Pro X, make sure to back up the currently installed version of the Logic Pro application and your Logic Pro projects.
New in Logic Pro X 10.4.4
Fixes an issue in which Logic Pro was not creating Auto Backups correctly.
Includes stability improvements.
Run software update and download this new version. There are no changes to the minimum OS requirements. Based on recent history over the last few years though, this very well may be the last Logic update supporting the Sierra (OS 10.12.x) operating system.