diff --git a/.changeset/flat-olives-pay.md b/.changeset/flat-olives-pay.md
new file mode 100644
index 000000000..eb9b20e6e
--- /dev/null
+++ b/.changeset/flat-olives-pay.md
@@ -0,0 +1,7 @@
+---
+"postgraphile": patch
+"grafast": patch
+---
+
+CRITICAL BUGFIX: mistake in optimization of list() can lead to arrays being
+truncated