Since the replacement of using Almanac devices instead of the Drydock hosts implementation, it seems you cannot create the replacement blueprint any more. You get this (sadly truncated) stack trace:
However, it seems the fix was rather simple since this fixed it for me:
diff --git a/src/applications/drydock/controller/DrydockBlueprintEditController.php b/src/applications/drydock/controller/DrydockBlueprintEditController.php index 1c75bf7..e94ca6a 100644 --- a/src/applications/drydock/controller/DrydockBlueprintEditController.php +++ b/src/applications/drydock/controller/DrydockBlueprintEditController.php @@ -34,6 +34,7 @@ final class DrydockBlueprintEditController extends DrydockBlueprintController { } $blueprint = DrydockBlueprint::initializeNewBlueprint($viewer); + $blueprint->attachImplementation($impl); $blueprint->setClassName($class); $cancel_uri = $this->getApplicationURI('blueprint/'); }