stderr: fatal: Couldn't find remote ref refs/changes/12/34567/8
fatal: The remote end hung up unexpectedly
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:981)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:920)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.fetch(CliGitAPIImpl.java:187)
at hudson.plugins.git.GitAPI.fetch(GitAPI.java:229)
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:610)
... 10 more

And there is no even attempt to retry...
(I have local Git-mirror, which updates from Gerrit. Jenkins fetching from that mirror, so it's ok when ref not "ready" yet)
In versions 1.* retrying works like a charm, so I have to roll back to 1.4