diff --git a/.github/workflows/sample-application.yml b/.github/workflows/sample-application.yml
index efb32a6d89..24bc5d46ac 100644
--- a/.github/workflows/sample-application.yml
+++ b/.github/workflows/sample-application.yml
@@ -199,12 +199,24 @@ jobs:
           [[ "${{ matrix.build-type }}" == "production" ]] && export CONFIG='release' || export CONFIG='debug'
 
           ./scripts/set-dsn-aos.mjs
-          # Build all ABIs (not just x86) so armeabi-v7a and the 64-bit ABIs are
-          # exercised too. The Sentry perf-logger native library is compiled from
-          # source per ABI, and ABI-specific breakage has shipped before (#6394
-          # 16 KB alignment, #6398 armeabi-v7a link) precisely because CI only
-          # built x86. The 16 KB alignment check below then runs across every ABI.
-          ./scripts/build-android.sh -PreactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
+          # Split ABI coverage across the two matrix entries:
+          #   - `dev`        → subset (arm64-v8a only) so we can assert the module
+          #                    builds only the ABIs the app requested — the root
+          #                    cause of #6398 was hardcoded abiFilters ignoring
+          #                    `reactNativeArchitectures`.
+          #   - `production` → all four ABIs so the 16 KB alignment check below
+          #                    runs across every ABI (guards against #6394).
+          if [[ "${{ matrix.build-type }}" == "production" ]]; then
+            ./scripts/build-android.sh -PreactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
+          else
+            ./scripts/build-android.sh -PreactNativeArchitectures=arm64-v8a
+          fi
+
+      - name: Check libsentry-tm-perf-logger.so honors reactNativeArchitectures
+        if: ${{ matrix.build-type == 'dev' }}
+        # Asserts the module packaged our .so for exactly the subset the app
+        # requested — guards against regressing the #6398 root-cause fix.
+        run: ./scripts/check-tm-perf-logger-abi-subset.sh ${{ env.REACT_NATIVE_SAMPLE_PATH }}/app.apk 'arm64-v8a'
 
       - name: Check 16 KB native library alignment
         # Only Sentry-owned libraries are checked: third-party/React Native
diff --git a/scripts/check-tm-perf-logger-abi-subset.sh b/scripts/check-tm-perf-logger-abi-subset.sh
new file mode 100755
index 0000000000..767072780a
--- /dev/null
+++ b/scripts/check-tm-perf-logger-abi-subset.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+# Regression guard for the `reactNativeArchitectures` fix in
+# https://github.com/getsentry/sentry-react-native/issues/6398.
+#
+# `libsentry-tm-perf-logger.so` is compiled from source in the consuming app.
+# `packages/core/android/build.gradle` must honour the host app's
+# `reactNativeArchitectures` property (like react-native-screens / reanimated
+# do) so the module builds only the ABIs the app requested. When it doesn't,
+# the module builds ABIs whose React Native `reactnative` prefab isn't
+# provided → link failure.
+#
+# This check asserts that a built APK contains `libsentry-tm-perf-logger.so`
+# for EXACTLY the ABIs the app requested — no more, no less. Point it at a
+# clean-build APK from a subset-ABI build (e.g. `-PreactNativeArchitectures=arm64-v8a`).
+#
+# Usage: scripts/check-tm-perf-logger-abi-subset.sh <path-to-apk-or-aab> <expected-abis-csv>
+#   e.g. scripts/check-tm-perf-logger-abi-subset.sh app.apk 'arm64-v8a'
+
+set -euo pipefail
+
+apk="${1:-}"
+expected_csv="${2:-}"
+if [[ -z "$apk" || ! -f "$apk" || -z "$expected_csv" ]]; then
+  echo "usage: $0 <path-to-apk-or-aab> <expected-abis-csv>" >&2
+  exit 2
+fi
+
+workdir="$(mktemp -d)"
+trap 'rm -rf "$workdir"' EXIT
+
+# Extract only the native libraries. APK stores them under `lib/`, AAB under `base/lib/`.
+unzip -qq -o "$apk" 'lib/*' 'base/lib/*' -d "$workdir" 2>/dev/null || true
+
+# ABIs where our library was packaged, one per line, sorted, unique.
+actual=$(
+  find "$workdir" -type f -name 'libsentry-tm-perf-logger.so' 2>/dev/null \
+    | sed -E 's|.*/lib/([^/]+)/.*|\1|' \
+    | sort -u
+)
+expected=$(echo "$expected_csv" | tr ',' '\n' | sed '/^$/d' | sort -u)
+
+echo "expected ABIs: $(echo $expected | tr '\n' ' ')"
+echo "actual ABIs:   $(echo $actual   | tr '\n' ' ')"
+
+if [[ -z "$actual" ]]; then
+  echo "✖ libsentry-tm-perf-logger.so not found in $apk" >&2
+  echo "  Expected it packaged for: $(echo $expected | tr '\n' ' ')" >&2
+  exit 1
+fi
+
+if [[ "$actual" != "$expected" ]]; then
+  echo "✖ ABI mismatch — module built ABIs the app did not request (or missed one)." >&2
+  echo "  Root cause of #6398: abiFilters not honoring reactNativeArchitectures." >&2
+  exit 1
+fi
+
+echo "✔ libsentry-tm-perf-logger.so packaged for exactly the requested ABI(s)"