fix(software-host): recover from system flushes, failed renderers and refused session rebuilds, with three small engine fixes - #912

fix(software-host): recover from system flushes, failed renderers and refused session rebuilds, with three small engine fixes#912

superuser404notfound merged 4 commits into

superuser404notfound:mainsuperuser404notfound/AetherEngine:mainfrom

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