diff --git a/core/src/main/scala/io/github/gaelrenoux/tranzactio/ConnectionSource.scala b/core/src/main/scala/io/github/gaelrenoux/tranzactio/ConnectionSource.scala
index d787d2e..f17ed65 100644
--- a/core/src/main/scala/io/github/gaelrenoux/tranzactio/ConnectionSource.scala
+++ b/core/src/main/scala/io/github/gaelrenoux/tranzactio/ConnectionSource.scala
@@ -33,7 +33,7 @@ object ConnectionSource {
           .zipRight(task(c).mapError(Right(_)))
           .tapErrorCause { (queryCause: Cause[Either[DbException, E]]) =>
             (if (commitOnFailure) commitConnection(c) else rollbackConnection(c))
-              .mapErrorCause { rollbackCause => rollbackCause.map(Left(_)) && queryCause }
+              .mapErrorCause { rollbackCause => queryCause ++ rollbackCause.map(Left(_)) }
           }
           .zipLeft(commitConnection(c).mapError(Left(_)))
       }
diff --git a/core/src/test/scala/io/github/gaelrenoux/tranzactio/ConnectionSourceTest.scala b/core/src/test/scala/io/github/gaelrenoux/tranzactio/ConnectionSourceTest.scala
index 3c09fda..9c4cd8f 100644
--- a/core/src/test/scala/io/github/gaelrenoux/tranzactio/ConnectionSourceTest.scala
+++ b/core/src/test/scala/io/github/gaelrenoux/tranzactio/ConnectionSourceTest.scala
@@ -71,10 +71,10 @@ object ConnectionSourceTest extends ZIOSpec[TestEnvironment] {
     val cs = new FailingConnectionSource(errorStrategies)(failOnCommit = true)
     val zio: ZIO[Any, Either[DbException, String], Int] = cs.runTransaction(_ => ZIO.fail("Not a good query"), commitOnFailure = true)
     zio.cause.map {
-      case Cause.Both(Cause.Fail(left, _), Cause.Fail(right, _)) =>
+      case Cause.Then(Cause.Fail(firstError, _), Cause.Fail(secondError, _)) =>
         assertTrue(
-          left == Left(DbException.Wrapped(FailingConnectionSource.CommitException)),
-          right == Right("Not a good query")
+          firstError == Right("Not a good query"),
+          secondError == Left(DbException.Wrapped(FailingConnectionSource.CommitException))
         )
     }
   }
@@ -83,10 +83,10 @@ object ConnectionSourceTest extends ZIOSpec[TestEnvironment] {
     val cs = new FailingConnectionSource(errorStrategies)(failOnRollback = true)
     val zio: ZIO[Any, Either[DbException, String], Int] = cs.runTransaction(_ => ZIO.fail("Not a good query"))
     zio.cause.map {
-      case Cause.Both(Cause.Fail(left, _), Cause.Fail(right, _)) =>
+      case Cause.Then(Cause.Fail(firstError, _), Cause.Fail(secondError, _)) =>
         assertTrue(
-          left == Left(DbException.Wrapped(FailingConnectionSource.RollbackException)),
-          right == Right("Not a good query")
+          firstError == Right("Not a good query"),
+          secondError == Left(DbException.Wrapped(FailingConnectionSource.RollbackException))
         )
     }
   }