Fix a miscompile that occurs when reading a matrix contained in a struct with no sibling fields - #8568

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, actions/setup-python@v4, aminya/setup-cpp@v1, step-security/changed-files@3dbe17c78367e7d60f00d78ae6781a35be47b4a1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/