We have found a trouble that after the Upgrade to Jira 8.20.10 that a costumfield
ist not longer called "Precondition", now its called "Preconditions".
I didnt found anything in the Realease Notes from Jira or Xporter.
Can anybody tell me about this issue?
Welcome to the Atlassian Community!
Jira only renames fields when there is a clash with a system field name and that only happens when a new application that adds a new system field is first installed. Apps won't do it, only Jira Service Management and Jira Software will do it. There is no system field called Precondition.
One of your administrators has renamed the field.
Check the admin audit log, it should name the person who reconfigured the field.