The Steam Client Beta has been updated with the following changes:
General
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Fixed game beta success/failure and dropdown not updating when opting into a password-protected beta branch
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Fixed Big Picture Mode not opening when Steam is set to launch on startup when configured as the default mode
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Fixed a regression in ISteamHTTP talking to servers with ALPN TLS extensions but no HTTP/2 support
Source: https://store.steampowered.com/news/gro ... 8462364717