Hi @michal-roszak_0767,
That icon indicates it's a remote package. That means it can be remote or cached. If you use the Pull to ProGet feature, then it will pull all the files locally and converts them to an internal/local package and those icons go away. If you combine that icon with the error "File not found on disk", this means the artifact was cached, but something deleted the file from disk. That is what Dean was trying to explain.
@misael-esperanzate_5668,
I think the next step from here is to navigate to Manage Feed -> Storage & Retention, and then run the re-index feed job (found to the right of storage) with the "Remove database entries for missing package files" option selected. That will remove any Maven artifacts from the database that are missing local files and allow them to be re-cached again. If you want to review the Maven artifacts that would be removed, run the re-index without selecting the remove database entries option. This will warn you of any Maven artifacts that a missing first, then you can run it again to remove them. Hope this helps!
Thanks,
Dan