diff --git a/modules/mesh-delivery-builder/buildrun/standing.go b/modules/mesh-delivery-builder/buildrun/standing.go
index e921c781..bc469fc9 100644
--- a/modules/mesh-delivery-builder/buildrun/standing.go
+++ b/modules/mesh-delivery-builder/buildrun/standing.go
@@ -60,6 +60,19 @@ func NewToolchainGate(modules []string, forward func(module, key string, value [
 	return g
 }
 
+// UseModules replaces the build modules whose reports the gate passes on again when the assignments moves (a part that
+// finds them from the seat list and the manifests, as the indexer does, gives them at each change), and passes every
+// report it holds on again. It answers whether what it passed on changed.
+func (g *ToolchainGate) UseModules(modules []string) bool {
+	g.mu.Lock()
+	defer g.mu.Unlock()
+	g.modules = map[string]bool{}
+	for _, m := range modules {
+		g.modules[m] = true
+	}
+	return g.all()
+}
+
 // Toolchain takes one change of a build module's toolchains bucket in and answers whether what it passed on changed.
 func (g *ToolchainGate) Toolchain(module, key string, value []byte, deleted bool) bool {
 	g.mu.Lock()
diff --git a/modules/mesh-delivery-builder/buildrun/standing_test.go b/modules/mesh-delivery-builder/buildrun/standing_test.go
index 506d0da2..cf875aa6 100644
--- a/modules/mesh-delivery-builder/buildrun/standing_test.go
+++ b/modules/mesh-delivery-builder/buildrun/standing_test.go
@@ -112,6 +112,23 @@ func TestToolchainGate(t *testing.T) {
 		}
 	})
 
+	t.Run("build modules given later pass their reports on when the assignments moves", func(t *testing.T) {
+		set := &ToolchainSet{}
+		gate := NewToolchainGate(nil, set.Put, func(string, ...any) {})
+		gate.Settled()
+		k, v := placing(t, "novox", GoBuildModule)
+		gate.Assignments(k, v, false, old)
+		key, value := gateReport(t, "ace", "v26.12.1", placed.Add(time.Minute))
+		gate.Toolchain(NodeBuildModule, key, value, false) // ace is not placed: left out
+		k, v = placing(t, "ace", NodeBuildModule)
+		if gate.Assignments(k, v, false, placed) || len(set.Entries("typescript")) != 0 {
+			t.Fatalf("a module the gate was not given passed on at the assignments: %v", set.Entries("typescript"))
+		}
+		if !gate.UseModules([]string{NodeBuildModule}) || len(set.Entries("typescript")) != 1 {
+			t.Fatalf("given mesh-build-node, ace's report placed since is passed on; entries %v", set.Entries("typescript"))
+		}
+	})
+
 	for _, c := range []struct {
 		name   string
 		at     time.Time // when ace wrote its report