10:10 UTC: We are investigating newly created transformations (in last 24 hours) that if run fails with an error `Unrecognized option "blocks" under "container"`. Next update in 15 minutes.
10:30 UTC [resolved]: We have identified the root cause and revert the latest changes of UI. From now on if a user creates a new transformation it will run without an error. However already created transformation are still affected, and manual update of the transformation is needed. In such case on the transformation detail page go the raw config editing page by appending "/raw" to the transformation detail page url. Then remove the topmost "blocks" array from the configuration and save it.