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That variable is not provided by Jenkins core. It's not defined without Zentimestamp.
Jenkins core changed the storage format and therefore the format of the BUILD_ID variable contents. If you were using it for something other than a reference to the build folder name (e.g. to indicate start date and time of a build), you now need to switch to using BUILD_TIMESTAMP provided by Zentimestamp, or determine the date on your own (some solutions provided in comments above).
The recent change in core was a documentation fix.