Lazy bricktron working in tunnel

TreeToTheVoid

In the map exile in invasion mode, I ordered the creation of a tunnel quite far away from my base (on the mountain where there is a lot of orange mineral, I cannot give you a save right away). So at first every available bricktron went to dig a little. But once a dozens voxels were dug out, they went back to the base.
Angrily I ordered poor Blum to work solely on the tunnel task.
And so he came and stayed around the tunnel doing nothing while looking very bored.
I suspect that either there is a bug, or a bricktron rebellion is going on.

Shatojon

Thank you!