diff --git a/t/t3429-rebase-edit-todo.sh b/t/t3429-rebase-edit-todo.sh
index b9292df..862f229 100755
--- a/t/t3429-rebase-edit-todo.sh
+++ b/t/t3429-rebase-edit-todo.sh
@@ -11,4 +11,26 @@
 	test -e F
 '
 
+test_expect_failure SHA1 'loose object cache vs re-reading todo list' '
+	GIT_REBASE_TODO=.git/rebase-merge/git-rebase-todo &&
+	export GIT_REBASE_TODO &&
+	write_script append-todo.sh <<-\EOS &&
+	# For values 5 and 6, this yields SHA-1s with the same first two digits
+	echo "pick $(git rev-parse --short \
+		$(printf "%s\\n" \
+			"tree $EMPTY_TREE" \
+			"author A U Thor <author@example.org> $1 +0000" \
+			"committer A U Thor <author@example.org> $1 +0000" \
+			"" \
+			"$1" |
+		  git hash-object -t commit -w --stdin))" >>$GIT_REBASE_TODO
+
+	shift
+	test -z "$*" ||
+	echo "exec $0 $*" >>$GIT_REBASE_TODO
+	EOS
+
+	git rebase HEAD -x "./append-todo.sh 5 6"
+'
+
 test_done