OS changed while updating a docker image

When using an image with digest pointing to a specific architecture and os, renovate ensure the same architecture but can use another OS.

For example, this image:

registry.k8s.io/csi-vsphere/driver:v3.3.1@sha256:5ef2f153813565d41a41c0700d1917c077f30bbbe735fd3f9e9ba18956d65bed

which is os=linux architecture=amd64

Current behavior

Image is updated to:

registry.k8s.io/csi-vsphere/driver:v3.3.1@sha256:9245b0dbe11af8a90080e2d59a0e488bc6272b20d50eab3f643967c3d117a957

which is os=windows architecture=amd64

Expected behavior

Like for architecture, os should not be changed.

Link to the Renovate issue or Discussion

Renovate Discussion: renovatebot/renovate#33166.

Production repo commit: https://gitlab.com/kubitus-project/kubitus-installer/-/commit/627599740756f69f46458aebc40c53d176f66c52?merge_request_iid=3550