Hello @rhessinger
Please did the default path for the packages change for docker images as according to the doc it supposed to reside in /var/proget/packages as such that's where the volume on the docker has been mapped.

Also the ./.docker/F2 folder exists in the /var/proget/packages/ Folder

I'm also getting this same error was on 5.3.12 when it started updated to 5.3.13 both mono and dotnet are not working with the Error

 Logged: 10/17/2020 13:12:50
 Level: Warning
 Category: Feed
 Message: A 500 error occurred in lcc-registry: Move failed. blobs/sha256/96a20c710d154a49eff959c842039d3969db46ef3904cfdf9a558f17ebcf2bee already exists.
 Details: URL: http://[URL]/v2/[Registry]/library/[Image]/blobs/uploads/6469c2a2-b41c-459e-8fb5-0d63d2f63c4a?digest=sha256:96a20c710d154a49eff959c842039d3969db46ef3904cfdf9a558f17ebcf2bee
Referrer: (not set)
User: Admin
User Agent: docker/19.03.8 go/go1.12.17 git-commit/afacb8b kernel/3.10.0-957.el7.x86_64 os/linux arch/amd64 UpstreamClient(Docker-Client/19.03.6 \(linux\))
Stack trace:

Please see error messages above
also checked the directory and the quoted files doesn't exisit

Hello there,
Please I'd like to inquire if there are any plans to create the 5.3 image for Proget anytime soon as It has been over a month since it's release and there is still image for it on docker hub

Thanks