Comment 2 for bug 1752932

I can't seem to test it on my machine, because of credentials (no secrets, nor access to the remote machine). Running bootstrap aio and then copying the user variables, env.d, and group vars fail on the proxy part of the user_variables.yml, which is expected, so i removed that part of your user_variables file.

Anyway... With all that set, it proves the user_variables, env.d, groups_vars, are not causing this.
It's definitely something that must appear from the inventory/remote node.

I'd be curious to know if ansible localhost -m debug -a msg="{{ hostvars['lsn-mc1023'] }}" -vvvv has the same problem.