diff --git a/.forgejo/workflows/dev-release.yml b/.forgejo/workflows/dev-release.yml
index 5c7b221..291d765 100644
--- a/.forgejo/workflows/dev-release.yml
+++ b/.forgejo/workflows/dev-release.yml
@@ -71,10 +71,10 @@ jobs:
             echo "::error::BAKERY_MINISIGN_SEC_KEY_PATH secret not set — refusing to regenerate dev index.json unsigned (would leave a stale signature mismatched against fresh content and break bakery for everyone on the dev track)"
             exit 1
           fi
-          rm -rf /tmp/bread-ecosystem-ci-* 2>/dev/null || true
-          # mktemp: a fixed clone path races when multiple repos' dev/beta
-          # workflows run close together on the same self-hosted runner.
-          ECOSYSTEM_CI_DIR="$(mktemp -d /tmp/bread-ecosystem-ci-XXXXXX)"
+          # Do not wipe /tmp/bread-ecosystem-ci-* — other products' ci/build.sh
+          # caches live there and a wipe between their build and test steps
+          # is a 127 (missing ci/build.sh).
+          ECOSYSTEM_CI_DIR="$(mktemp -d /tmp/bread-ecosystem-index-XXXXXX)"
           git clone --branch main https://git.breadway.dev/Breadway/bread-ecosystem.git "${ECOSYSTEM_CI_DIR}"
           TRACK=dev bash "${ECOSYSTEM_CI_DIR}/scripts/gen-index.sh"
           rm -rf "${ECOSYSTEM_CI_DIR}"
diff --git a/ci/build.sh b/ci/build.sh
index 668b199..63262e8 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -12,8 +12,8 @@ ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 REV="$(cat "${ROOT}/ci/bread-ecosystem.rev")"
 
 CACHE_DIR="/tmp/bread-ecosystem-ci-${REV}"
-if [ ! -d "$CACHE_DIR" ]; then
-    rm -rf /tmp/bread-ecosystem-ci-*
+if [ ! -f "$CACHE_DIR/ci/build.sh" ]; then
+    rm -rf "$CACHE_DIR"
     git clone https://git.breadway.dev/Breadway/bread-ecosystem.git "$CACHE_DIR"
     git -C "$CACHE_DIR" checkout --quiet "$REV"
 fi