Myrmex can't break blocks that cover their tunnels, just freeze in place if any obstacles.

[lSherozl]

A myrmex colony spawned with a block of stone in the middle, the myrmex workers just stood there unable to break the stone, and reconnect their tunnels. There needs to be a way for the myrmex to be able to break stone and other materials to either expand their nests, or to fix broken or unconnected parts of their nest. Sometimes the nests just spawn broken like this, where tunnels are disconnected.

Reproduce Issue: Place any blocks to disconnect each tunnel and workers will just sit there doing nothing with things they had collected in their mouths waiting for a way to get through to other sides of the tunnels. So basically they just freeze there.

Expected: They should break the blocks reconnect the tunnels or any of the broken parts of the nest.

[DigitalWendigo]

Myrmex don't break blocks except for leaves, dead bushes and cacti. If you clog up the tunnels they will indeed just sit and wait untill you, the player, unclogs it.

In the latest Alpha release the myrmex will actively try to seek out other ways to get to their destination, in case the tunnels are not entirely blocked off and there is still a small gap to fit through. This probably doesn't fix the issue if something else were to generate directly through the tunnel, causing a blockage, but it does fix their pathing issues if something small spawns in their way.