Why does updating the version of Kubernetes result in updating the bootstrap spec

[scouser255]

The version of kubernetes was updated from 1.30.4 to 1.31.6 in the cluster template which does not have a bootstrap section. The version of kubernetes was updated but the pipeline reported the error below :

Error: rpc error: code = InvalidArgument desc = failed to validate: 1 error occurred:
* bootstrap spec is immutable after creation

Why is a version update considered a bootstrap update? How should kubernetes by upgraded to avoid this issue?

[utkuozdemir]

It looks like a bug, I'll look into it in #1326.