Karl Shultz has prepared testing notes
See also the linked duplicate ticket for another example of the stack trace. It seems related to time harmonizer - but more investigation needed.
Reproduction instructions: not clear.
This likely may be valid data and it just needs to be hardened a bit to undefined fields.
For some reason one of the builds has the result "undefined" (probably because the server restarted while running? or probably because I deleted some jobs because I was running out of disk space?)... Anyways, that issue causes the activity screen on blue ocean to fail loading with the following error:
blueocean.js:6247 Error fetching page TypeError: Cannot read property 'toLowerCase' of undefined
Attached screenshots of the error. I deleted all the jobs from Jenkins and the error was still happening. The only workaround I've found was to delete and re-create the pipeline.