try denyNonFastForwards = false again

project.config

diff --git a/project.config b/project.config
index a3e65a5..ad41c5e 100644
--- a/project.config
+++ b/project.config
@@ -5,6 +5,7 @@
 	requireSignedOffBy = false
 	requireChangeId = true
 	createNewChangeForAllNotInTarget = false
+	denyNonFastForwards = false
 [accounts]
 	sameGroupVisibility = deny group contributed-in-past
 	sameGroupVisibility = deny group google/google-union:signcla