And this includes LXD.
I think this plugin could use some love from the community, and now that it’s in its own repo, contribution will be easier.
I have suggested another enhancement to the provisioner here Proposal: A dedicated lxc-exec provisioner · Issue #17 · hashicorp/packer-plugin-lxd · GitHub
This would bring better support for the various flags of lxc exec, which I think would be a killer feature.