Docker images disappearing in docker inside minikube vm

I installed and configured minikube with vbox as vm driver on Oracle Linux 8. At first it seems that everything is working as expected. I do eval $(minikube docker-env) and then use docker inside minikube vm to load some images. Loading is successful, I can even use these images with helm charts. But after a while (lets say hour or two images start disappearing from docker).

docker image ls --all does not list them anymore. I cannot use them in helm charts anymore also (I get image pull error). I can then load them again but later they disappear. What could be reason for this, it seems really strange to me? I can then load them again but later they disappear.

Any help much appreciated!

Cluster information:

Kubernetes version: minikube version: v1.4.0
Cloud being used: bare-metal
Host OS: Oracle Linux 8

I am hitting k8s garbage collection. I made a new kubernetes VM with overrided (bigger) virtual disk size and issue does not occur anymore.