I have a promotion with downstream job and manual conditions:
It has been working correctly for some time.
Today after giving the manual approval the promotion failed to start.
The page showed
This promotion has not happened.
Pressing re-execute promotion opens URL JobName/177/PromotionName/build with a 404 status.
There are no relevant entries in Jenkins log.
Job folder on Jenkins master looks OK, the PromotionName folder with logs etc. is there.
I was only able to execute the promotion by using "Force Promotion". When it executed it got the number immediately following last promotion – it's not a case of promotion being temporarily invisible as in JENKINS-39648