The reason is this PR where this change (https://github.com/jenkinsci/jenkins/pull/5275/files#diff-5a6844edf24a38eb269d0f5918e2b101b6394cff7994a8957a68118f1cca7b99R52) was introduced to explicitly return a ““ instead of null.
We need to adapt the test.
|Field||Original Value||New Value|
|Status||Open [ 1 ]||In Progress [ 3 ]|
|Status||In Progress [ 3 ]||In Review [ 10005 ]|
|Released As||1.24.7 includes the fix|
|Resolution||Fixed [ 1 ]|
|Status||In Review [ 10005 ]||Closed [ 6 ]|