I've not checked later versions. Maybe it was already fixed on 1.2.7 or 1.3/1.4 ?

In T2855#95665, @Viacheslav wrote:

I can't reproduce it in 1.2.7

Looks like it's a floating bug - I've just sucscessfuly disabled a vti interface on another router (running vyos 1.2.6-epa1).

Copy failed too.

I've made some hacks to get vyatta-config-sync working with ssh-keys (and working at all).

Just upgraded another router from 1.1.8 to 1.2.0-epa3 without this problem.

Hmm... The config contains only one user - for which one I've reseted password. The user 'vyos' is completely missing!

Resetting password right now... Done, access granted!
It was lucky that I have access to console at this time...

I have tested it in the 1.2.0-rc11. The problem only present when there is no established SAs exists.

Gentlemen, you've forgot to add this fix to the changelog.