I can confirm that this happens on 1.0.0.29 (experimental) and has happened to me reproducibly on multiple servers.
The built razor wire fences in conflict mode disappear a while (maybe a minute) after being built.

@Failware - thanks for the feedback. By the way, people are jumping around on the wire. It should hurt, and cause bleeding. Maybe that can be added. Currently it disappears after building. Thanks BI.

The (changed) razor wire in 1.0.0.38 seems to work, at least it stayed for a whole match.
But the dragon teeth (now) show the behaviour of disappearing.

Hello everyone.
Are there any issues present still at the current stable?

Yes, still present. Especially roadblock composition. Sometime you have to run then jump over it. If you simply stand beside it, then jump, it may not work.