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bcdedit.exe command giving strange error

Until yesterday i could use the command bcdedit /set testsigning on, so that i could start kernel mode drivers that are not signed, and then bcdedit /set testsigning off before shutting down, and i used this command so many times.
Suddenly, the command is now giving me the error

An error has occurred setting the element data.
The value is protected by Secure Boot policy and cannot be modified or deleted.

The true problem is that i’ve always had secure boot enabled, but bcdedit suddenly isn’t fine with it anymore.
What could be causing this? I know a solution would be just to disable secure boot, but i would prefer not to do that and instaed figure out what other thing is causing this