diff --git a/.github/composite/godot-itest/action.yml b/.github/composite/godot-itest/action.yml
index 14e7e73eb..f7cb8857a 100644
--- a/.github/composite/godot-itest/action.yml
+++ b/.github/composite/godot-itest/action.yml
@@ -72,11 +72,82 @@ runs:
     - name: "Inspect Godot version"
       run: |
         godotVer=$($GODOT4_BIN --version | xargs)
-        echo ":heavy_check_mark: Version \`$godotVer\`" >> $GITHUB_STEP_SUMMARY
+        gitSha=$(echo $godotVer | sed -E "s/.+custom_build\.//")
+        echo "GODOT_BUILT_FROM=_Built from [\`$godotVer\`](https://github.com/godotengine/godot/commit/$gitSha)._" >> $GITHUB_ENV
+      shell: bash
+
+    - name: "Install Rust"
+      uses: ./.github/composite/rust
+      with:
+        rust: ${{ inputs.rust-toolchain }}
+        with-llvm: ${{ inputs.with-llvm }}
+
+    - name: "Patch prebuilt version ({{ inputs.godot-prebuilt-patch }})"
+      if: inputs.godot-prebuilt-patch != ''
+      env:
+        VERSION: ${{ inputs.godot-prebuilt-patch }}
+      # sed -i'' needed for macOS compatibility, see https://stackoverflow.com/q/4247068
+      run: |
+        echo "Patch prebuilt version to $VERSION..."
+        
+        # Reduce version to "major.minor" format
+        apiVersion=$(echo $VERSION | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')
+        
+        # For newer versions, update the compatibility_minimum in .gdextension files to the respective version.
+        # Nothing needs to be done for 4.0.x, as compatibility_minimum didn't exist back then.
+        if [[ "$apiVersion" == "4.2" ]]; then
+          echo "Update compatibility_minimum in .gdextension files to '$apiVersion'..."
+          dirs=("itest" "examples")
+          for dir in "${dirs[@]}"; do
+              find "$dir" -type f -name "*.gdextension" -exec sed -i'.bak' 's/compatibility_minimum = 4\.1/compatibility_minimum = $apiVersion/' {} +
+          done
+        
+        # Apply Cargo.toml patch for godot4-prebuilt crate
+        else
+          # Patch only needed if version is not already set
+          if grep -E 'godot4-prebuilt = { .+ branch = "$VERSION" }' godot-bindings/Cargo.toml; then
+            echo "Already has version $version; no need for patch."
+          else
+            cat << HEREDOC >> Cargo.toml
+        [patch."https://github.com/godot-rust/godot4-prebuilt"]
+        godot4-prebuilt = { git = "https://github.com//godot-rust/godot4-prebuilt", branch = "$VERSION" }
+        HEREDOC
+            echo "Patched Cargo.toml for version $version."
+          fi
+        fi
+
+      shell: bash
+
+    # else
+    - name: "No patch selected"
+      if: inputs.godot-prebuilt-patch == ''
+      run: |
+          echo "No patch selected; use default godot4-prebuilt version."
+      shell: bash
+
+    - name: "Build gdext (itest)"
+      env:
+        RUSTFLAGS: ${{ inputs.rust-env-rustflags }}
+        TARGET: ${{ inputs.rust-target }}
+      run: |
+        cargo build -p godot-ffi
+        echo "OUTCOME=success" >> $GITHUB_ENV
       shell: bash
 
     - name: "Conclusion"
-      if: failure()
+      if: always()
       run: |
-        echo ":x: Failed to get version" >> $GITHUB_STEP_SUMMARY
+        echo "Evaluate conclusion: $OUTCOME"
+        
+        case $OUTCOME in
+          "success")
+             # Do not output success for now, to keep summary focused on warnings/errors
+             #echo "### :heavy_check_mark: $GODOT_BUILT_FROM" > $GITHUB_STEP_SUMMARY
+            ;;
+
+          *)
+            echo "### :x: Build failed" > $GITHUB_STEP_SUMMARY
+            exit 5
+            ;;
+        esac
       shell: bash