host_vars mystery

Hello,

Have an odd problem with host_vars, work different on two systems.
Using 2.1.2.0, Centos 6 on both.

On problem system, a run with only one host from inventory is failing to pickup host_vars for other hosts, while groups_vars are correct.
If, on same system, run with all hosts shows the expected value, confirmed via ‘-debug: vars=hostvars’.

On another system, same setup, same user, same repo of playbook, same commit, run with single host shows the correct host_vars for all hosts.

I’ve broken down to simple playbook file:

I finally reverted to ansible version 2.1.0.0, with this the run completed as expected.