The Timestamper plugin documentation says the following:

The Timestamper plugin adds timestamps to the console output of Jenkins jobs. For example:

21:51:15 Started by user anonymous
21:51:15 Building on master
21:51:17 Finished: SUCCESS

However, my pipeline jobs are not giving me timestamps on any of these 3 line equivalents (though I am getting timestamps for the other console output in between). Not sure if this is a bug or removed functionality (or if I am doing something wrong?) - please let me know. Thanks!