Reading specific registry key IdentityCRL leads to IOException

Question

I have a strange problem with reading the access control of a specific registry key in C#. This code produces an IOException :

RegistryKey key = Registry.ClassesRoot.OpenSubKey(@"VirtualStore\MACHINE\SOFTWARE\WOW6432Node\Microsoft\IdentityCRL");
RegistrySecurity rs = key.GetAccessControl(); // throws

The message of the exception is that the specified registry key does not exist. However, when I look manually into the registry by using regedit, the key is clearly there.

The above code works fine for any other registry key I have tried so far.

I also tripple checked the path already, so that should not be the cause either.

Question : Anyone knows why this specific key causes problems?