Many tests are now failing with UpdatePathTestBase, could be a core regression.
The first test we see this issue with is https://dispatcher.drupalci.org/job/default/37588/consoleFull
The most recent is https://dispatcher.drupalci.org/job/default/37779/consoleFull
Total of 22 tests have failed like this today..
Its possible that something in #2382675: hook_entity_create() affects the data of new translations of existing entities in unexpected and undocumented ways is causing some kind of racey condition to happen.