Thank you for reporting this - in essence what you are experiencing was an oversight in the validation of the kernel parameters.
Kernel parameters are only supported on systems where a model assertion is available, and has both a kernel and gadget snap. On regular, classic systems, like yours, this is not supported.
A PR has just been merged to add additional safeguards around this. This fix is scheduled for snapd 2.64.
Hey!
Thank you for reporting this - in essence what you are experiencing was an oversight in the validation of the kernel parameters.
Kernel parameters are only supported on systems where a model assertion is available, and has both a kernel and gadget snap. On regular, classic systems, like yours, this is not supported.
A PR has just been merged to add additional safeguards around this. This fix is scheduled for snapd 2.64.