Ubuntu-image warning: kernel snap

Hi there. One of my friends came across this warning on their machine:

Basically, they are trying to build a image for their Raspberry Pi CM4, but is concerned about the warning message saying: The kernel for the specified UC20+ model does not carry assertion max format information, assuming possibly incorrectly the kernel revision can use the same formats as snapd.

Now what in the blue blazes does this mean? I hope some of the maintainers can shed some light on this?