D3D11 Games and applications are now being affected by the same issue D3D9 games were

There was DXGI.dll update indeed on 2.9.2019. So it is quite possible.
The cache corruption may take place if RTSS is started in "unlucky" moment, exactly when OS is replacing Direct3D or DXGI libraries with newer version. Bad offsets can be precached if such upgrade is in progress but not finalized yet.
I think I'll add cheap and rather effective workaround, which can minimize the chances of such corruptions. Instead of reinitializing the cache just once when newer version of D3D/DXGI library is detected in Windows system folders, RTSS will simply set cache reinit retry counter to some non zero value. So it will also forcibly reset cache on the next N RTSS startups after detecting D3D/DXGI DLL replace event. It will be enough to ensure that the upgrade is completed and proper offsets are cached.