That's why I was wondering if something new/updated didn't set some system-wide QTWEBENGINE_CHROMIUM_FLAGS values.
One should be able to use --ignore-gpu-buglist as either a command-line argument to Sigil (it will be passed to QtWebEngineProcess) or as a value in the above env var for testing purposes. If it allows hardware acceleration to work again, then including that workaround code may be the best overall solution.
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