How weird, I don't appear to be able to reproduce in a simplified fashion.
I shall investigate further. Here's my attempt (that works as expected):
import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.Source
import scala.concurrent.duration._
import scala.concurrent.Promise
import scala.concurrent.ExecutionContext.Implicits.global
implicit val system = ActorSystem("test")
implicit val mat = ActorMaterializer()
val someSource = Source.single("someSource").initialDelay(1.second)
val somePromise = Promise[String]
someSource.concat(Source.fromFuture(somePromise.future)).runForeach(println)
somePromise.success("somePromise")
--
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