Welded Projector doesn't always load blueprint
A projector is using a template and some welders are welding it. In this blueprint is another projector, loaded with the same template (this is a tunnel, the template is 10 block long and it's repeating).
When welded, the 2nd projector doesn't always have a blueprint loaded, which interrupt the process of digging the tunnel.
The video contains explanations of the setup/problem at the beginning, 1 normal operation cycle (projector has a blueprint, everything is good) and then the next cycle the projector doesn't load the blueprint.
It's quite long (Old PC here, so recording slowed thing down). Normally a cycle is ~5 minute.
If, after seeing the normal operation (1rst Projector welded and having a blueprint) you want to skip forward, go to ~20:00.
Is this behavior a bug / what did I do wrong?