Jobs with milestones configured seem to randomly hang and never get past the first milestone.  Most are configured with a timeout and so they eventually fail with an output like 

Started by user Elikem Gbanaglo (elikemg)
Resume disabled by user, switching to high-performance, low-durability mode.
[Pipeline] timeout
Timeout set to expire in 2 hr 10 min
[Pipeline]

{ [Pipeline] echo trying to get past milestone 0 [Pipeline] milestone Trying to pass milestone 0 [Pipeline] }

[Pipeline] // timeout
[Pipeline] echo
[Pipeline] End of Pipeline

The typical pattern being used by jobs is:

timeout(time: 10, unit: 'MINUTES'){ 
  milestone()  
  lock(resource: "${env.JOB_NAME}", inversePrecedence: true) {
    node('master')

{           // do something             }

     milestone()
   }
}

When we comment out the milestone steps, the jobs consistently run

We have seen this error in the log, but are unsure if it is related