diff --git a/actions/build/action.yml b/actions/build/action.yml
index 75e5fce..ef035e9 100644
--- a/actions/build/action.yml
+++ b/actions/build/action.yml
@@ -71,6 +71,9 @@ runs:
   using: composite
   steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+      with:
+        # Preserve caller-restored build caches (e.g. .next/cache) — git clean -ffdx would wipe them before the build runs.
+        clean: false
 
     - name: Setup toolchain
       if: inputs.node-version != ''